292 lines
10 KiB
C#
292 lines
10 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Linq;
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using System.Xml.Linq;
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namespace JiShe.CollectBus.Common.Extensions
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{
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public static class DataTableExtensions
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{
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/// <summary>Converts to list.</summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="dt">The dt.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("转换为列表")]
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public static IList<T> ToList<T>(this DataTable dt) where T : class
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{
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IList<T> list = new List<T>();
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foreach (DataRow dr in dt.Rows)
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{
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T t = Activator.CreateInstance<T>();
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var props = typeof(T).GetProperties();
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foreach (var pro in props)
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{
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var tempName = pro.Name;
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if (!dt.Columns.Contains(tempName)) continue;
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if (!pro.CanWrite) continue;
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var value = dr[tempName];
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if (value != DBNull.Value)
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pro.SetValue(t, value, null);
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}
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list.Add(t);
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}
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return list;
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}
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/// <summary>Converts to data table.</summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="source">The source.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("转换为DataTable")]
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public static DataTable ToDataTable<T>(this ICollection<T> source)
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{
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var props = typeof(T).GetProperties();
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var dt = new DataTable();
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dt.Columns.AddRange(props.Select(p =>
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new DataColumn(p.Name,
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(p.PropertyType.IsGenericType) && (p.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
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? p.PropertyType.GetGenericArguments()[0]
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: p.PropertyType)).ToArray());
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for (var i = 0; i < source.Count; i++)
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{
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var tempList = new ArrayList();
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foreach (var obj in props.Select(pi => pi.GetValue(source.ElementAt(i), null))) tempList.Add(obj);
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var array = tempList.ToArray();
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dt.LoadDataRow(array, true);
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}
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return dt;
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}
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/// <summary>Converts to xml.</summary>
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/// <param name="dt">The dt.</param>
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/// <param name="rootName">Name of the root.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("转换为Xml")]
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public static XDocument ToXml(this DataTable dt, string rootName)
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{
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var xdoc = new XDocument
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{
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Declaration = new XDeclaration("1.0", "utf-8", "")
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};
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xdoc.Add(new XElement(rootName));
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foreach (DataRow row in dt.Rows)
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{
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var element = new XElement(dt.TableName);
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foreach (DataColumn col in dt.Columns)
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{
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element.Add(new XElement(col.ColumnName, row[col].ToString().Trim(' ')));
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}
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xdoc.Root?.Add(element);
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}
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return xdoc;
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}
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/// <summary>
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/// "SELECT DISTINCT" over a DataTable
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/// </summary>
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/// <param name="sourceTable">Input DataTable</param>
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/// <param name="fieldName">Field to select (distinct)</param>
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/// <returns></returns>
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[Description("在DataTable中'SELECT DISTINCT'")]
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public static DataTable SelectDistinct(this DataTable sourceTable, string fieldName)
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{
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return SelectDistinct(sourceTable, fieldName, string.Empty);
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}
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/// <summary>
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/// "SELECT DISTINCT" over a DataTable
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/// </summary>
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/// <param name="sourceTable">Input DataTable</param>
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/// <param name="fieldNames">Fields to select (distinct) Split ','</param>
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/// <param name="filter">Optional filter to be applied to the selection</param>
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/// <returns></returns>
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public static DataTable SelectDistinct(this DataTable sourceTable, string fieldNames, string filter)
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{
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var dt = new DataTable();
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var arrFieldNames = fieldNames.Replace(" ", "").Split(',');
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foreach (var s in arrFieldNames)
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{
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if (sourceTable.Columns.Contains(s))
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dt.Columns.Add(s, sourceTable.Columns[s].DataType);
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else
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throw new Exception($"The column {s} does not exist.");
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}
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object[] lastValues = null;
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foreach (DataRow dr in sourceTable.Select(filter, fieldNames))
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{
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var newValues = GetRowFields(dr, arrFieldNames);
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if (lastValues == null || !(ObjectComparison(lastValues, newValues)))
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{
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lastValues = newValues;
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dt.Rows.Add(lastValues);
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}
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}
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return dt;
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}
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/// <summary>Selects the rows.</summary>
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/// <param name="dt">The dt.</param>
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/// <param name="whereExpression">The where expression.</param>
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/// <param name="orderByExpression">The order by expression.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("查询全部行")]
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public static DataTable SelectRows(this DataTable dt, string whereExpression, string orderByExpression)
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{
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dt.DefaultView.RowFilter = whereExpression;
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dt.DefaultView.Sort = orderByExpression;
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return dt.DefaultView.ToTable();
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}
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/// <summary>take any DataTable and remove duplicate rows based on any column.</summary>
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/// <param name="dt">The dt.</param>
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/// <param name="keyColName">Name of the key col.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("删除重复的行")]
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public static DataTable Duplicate(this DataTable dt, string keyColName)
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{
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var tblOut = dt.Clone();
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foreach (DataRow row in dt.Rows)
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{
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var found = false;
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var caseIdToTest = row[keyColName].ToString();
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foreach (DataRow row2 in tblOut.Rows)
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{
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if (row2[keyColName].ToString() == caseIdToTest)
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{
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found = true;
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break;
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}
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}
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if (!found)
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tblOut.ImportRow(row);
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}
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return tblOut;
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}
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/// <summary>Checks if two DataTable objects have the same content.</summary>
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/// <param name="thisDataTable">The this data table.</param>
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/// <param name="otherDataTable">The other data table.</param>
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/// <returns>
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/// <br />
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/// </returns>
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[Description("检查两个DataTable对象是否具有相同的内容")]
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public static bool EqualsByContent(this DataTable thisDataTable, DataTable otherDataTable)
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{
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// Compare row count.
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if (thisDataTable.Rows.Count != otherDataTable.Rows.Count)
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{
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return false;
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}
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// Compare column count.
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if (thisDataTable.Columns.Count != otherDataTable.Columns.Count)
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{
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return false;
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}
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// Compare data in each cell of each row.
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for (int i = 0; i < thisDataTable.Rows.Count; i++)
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{
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for (int j = 0; j < thisDataTable.Columns.Count; j++)
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{
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if (!thisDataTable.Rows[i][j].Equals(otherDataTable.Rows[i][j]))
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{
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return false;
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}
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}
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}
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// The two DataTables contain the same data.
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return true;
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}
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/// <summary>Renames the column.</summary>
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/// <param name="dt">The dt.</param>
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/// <param name="oldName">The old name.</param>
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/// <param name="newName">The new name.</param>
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[Description("重命名列")]
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public static void RenameColumn(this DataTable dt, string oldName, string newName)
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{
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if (dt != null && !string.IsNullOrEmpty(oldName) && !string.IsNullOrEmpty(newName) && oldName != newName)
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{
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int idx = dt.Columns.IndexOf(oldName);
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dt.Columns[idx].ColumnName = newName;
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dt.AcceptChanges();
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}
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}
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/// <summary>Removes the column.</summary>
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/// <param name="dt">The dt.</param>
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/// <param name="columnName">Name of the column.</param>
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[Description("删除列")]
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public static void RemoveColumn(this DataTable dt, string columnName)
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{
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if (dt != null && !string.IsNullOrEmpty(columnName) && dt.Columns.IndexOf(columnName) >= 0)
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{
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int idx = dt.Columns.IndexOf(columnName);
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dt.Columns.RemoveAt(idx);
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dt.AcceptChanges();
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}
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}
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private static object[] GetRowFields(DataRow dr, string[] arrFieldNames)
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{
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if (arrFieldNames.Length == 1)
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return new object[] { dr[arrFieldNames[0]] };
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var itemArray = new ArrayList();
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foreach (var field in arrFieldNames)
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itemArray.Add(dr[field]);
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return itemArray.ToArray();
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}
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private static bool ObjectComparison(object a, object b)
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{
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if (a == DBNull.Value && b == DBNull.Value) // both are DBNull.Value
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return true;
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if (a == DBNull.Value || b == DBNull.Value) // only one is DBNull.Value
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return false;
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return a.Equals(b); // value type standard comparison
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}
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private static bool ObjectComparison(IReadOnlyList<object> a, IReadOnlyList<object> b)
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{
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var retValue = true;
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if (a.Count == b.Count)
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for (var i = 0; i < a.Count; i++)
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{
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if (!ObjectComparison(a[i], b[i]))
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{
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retValue = false;
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break;
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}
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retValue = true;
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}
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return retValue;
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}
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}
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}
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