139 lines
4.3 KiB
C#
139 lines
4.3 KiB
C#
using System.Collections;
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using System.Data;
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namespace ShrlAlgo.Toolkit.Core.Extensions;
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public static class DataTableExtensions
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{
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/// <summary>
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/// 获取数据
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/// </summary>
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/// <param name="dt"></param>
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/// <param name="row"></param>
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/// <param name="column"></param>
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/// <returns></returns>
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public static string GetValue(this DataTable dt, int row, int column)
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{
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return dt != null ? dt.Rows[row][column].ToString() : string.Empty;
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}
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/// <summary>
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/// 获取值
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/// </summary>
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/// <param name="dr"></param>
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/// <param name="column"></param>
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/// <returns></returns>
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/// <exception cref="ArgumentNullException"></exception>
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public static string GetValue(this DataRow dr, int column)
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{
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return dr == null ? throw new ArgumentNullException(nameof(dr)) : dr[column].ToString();
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}
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/// <summary>
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/// 设置值
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/// </summary>
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/// <param name="dt"></param>
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/// <param name="row"></param>
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/// <param name="column"></param>
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/// <param name="value"></param>
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public static void SetValue(this DataTable dt, int row, int column, object value)
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{
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dt.Rows[row][column] = value;
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}
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/// <summary>
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/// 设置值
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/// </summary>
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/// <param name="dr"></param>
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/// <param name="column"></param>
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/// <param name="value"></param>
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/// <exception cref="ArgumentNullException"></exception>
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public static void SetValue(this DataRow dr, int column, object value)
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{
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if (dr == null)
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{
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throw new ArgumentNullException(nameof(dr));
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}
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dr[column] = value;
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}
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/// <summary>
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/// 转实体，属性名必须与列名相同
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="table"></param>
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/// <returns></returns>
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public static List<T> ToEntities<T>(this DataTable table)
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where T : new()
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{
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var entities = new List<T>();
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if (table == null)
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{
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return null;
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}
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foreach (DataRow row in table.Rows)
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{
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T entity = new();
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foreach (var item in entity.GetType().GetProperties())
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{
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if (table.Columns.Contains(item.Name))
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{
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if (DBNull.Value != row[item.Name])
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{
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var newType = item.PropertyType;
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//判断type类型是否为泛型，因为nullable是泛型类,
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if (newType.IsGenericType && newType.GetGenericTypeDefinition() == typeof(Nullable<>)) //判断convertsionType是否为nullable泛型类
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{
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//如果type为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
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var nullableConverter = new System.ComponentModel.NullableConverter(newType);
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//将type转换为nullable对的基础基元类型
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newType = nullableConverter.UnderlyingType;
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}
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item.SetValue(entity, Convert.ChangeType(row[item.Name], newType), null);
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}
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}
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}
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entities.Add(entity);
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}
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return entities;
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}
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/// <summary>
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/// 将指定的集合转换成DataTable。
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/// </summary>
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/// <param name="list">将指定的集合。</param>
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/// <returns>返回转换后的DataTable。</returns>
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public static DataTable ToDataTable(this IList list)
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{
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var table = new DataTable();
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var properties = list[0].GetType().GetProperties();
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foreach (var pi in properties)
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{
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var pt = pi.PropertyType;
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if (pt.IsGenericType && pt.GetGenericTypeDefinition() == typeof(Nullable<>))
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{
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pt = pt.GetGenericArguments()[0];
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}
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table.Columns.Add(new DataColumn(pi.Name, pt));
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}
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for (var i = 0; i < list.Count; i++)
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{
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var tempList = new ArrayList();
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foreach (var pi in properties)
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{
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var obj = pi.GetValue(list[i], null);
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tempList.Add(obj);
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}
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var array = tempList.ToArray();
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table.LoadDataRow(array, true);
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}
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return table;
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}
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}
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