(原创)[C#] DataTable排序扩展方法

2021/8/31 22:36:38

本文主要是介绍(原创)[C#] DataTable排序扩展方法,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

一,前言

DataTable的应用极其广泛,对DataTable进行排序也有很多方式,每种的实现方式都不难,但是使用起来却比较繁琐,所以本人便写了一个扩展方法,专门对DataTable进行操作。
本篇是使用Linq的方式去实现排序,代码很简单,封装后,使用起来也极其方便。
本扩展方法支持升序/降序排列,支持列以String、Double、Int、Datetime等方式排序

相信看完的你,一定会有所收获!

本文地址:https://www.cnblogs.com/lesliexin/p/15212026.html

二,源码

下面直接贴出扩展方法源代码,代码很简单:

using System;
using System.Data;
using System.Linq;

namespace DatatableSortDemo
{
    /// <summary>
    /// DataTable排序扩展
    /// </summary>
    public static class DatatableSort
    {
        /// <summary>
        /// 排序方式
        /// </summary>
        public enum SortType
        {
            /// <summary>
            /// 升序
            /// </summary>
            ASC,
            /// <summary>
            /// 降序
            /// </summary>
            DESC
        }
        /// <summary>
        /// 列的类型
        /// </summary>
        public enum ColumnType
        {
            /// <summary>
            /// String
            /// </summary>
            STRING,
            /// <summary>
            /// Int
            /// </summary>
            INT,
            /// <summary>
            /// Double
            /// </summary>
            DOUBLE,
            /// <summary>
            /// Datetime
            /// </summary>
            DATETIME
        }
        /// <summary>
        /// String转Double
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static double StrToDouble(this string str)
        {
            try
            {
                var d = Convert.ToDouble(str);
                return d;
            }
            catch (Exception)
            {
                return 0;
            }
        }
        /// <summary>
        /// String转Int
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static int StrToInt(this string str)
        {
            try
            {
                var d = str.StrToDouble();
                int i = Convert.ToInt32(d);
                return i;
            }
            catch (Exception)
            {
                return 0;
            }
        }
        /// <summary>
        /// String转DateTime
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static DateTime StrToDatetime(this string str)
        {
            try
            {
                var d = Convert.ToDateTime(str);
                return d;
            }
            catch (Exception)
            {
                return new DateTime();
            }
        }
        /// <summary>
        /// String转Object
        /// </summary>
        /// <param name="str"></param>
        /// <param name="colType"></param>
        /// <returns></returns>
        public static object StrToObject(this string str,ColumnType colType)
        {
            if (colType == ColumnType.STRING)
            {
                return str;
            }
            else if (colType == ColumnType.DOUBLE)
            {
                return str.StrToDouble();
            }
            else if (colType == ColumnType.INT)
            {
                return str.StrToInt();
            }
            else
            {
                return str.StrToDatetime();
            }
        }
        /// <summary>
        /// 排序
        /// </summary>
        /// <param name="dataTable">待排序Datatable</param>
        /// <param name="colName">排序的列</param>
        /// <param name="colType">排序列的类型</param>
        /// <param name="sortType">排序方式</param>
        /// <returns>排序后的Datetable</returns>
        public static DataTable Sort(this DataTable dataTable, string colName, ColumnType colType, SortType sortType)
        {
            try
            {
                if (sortType == SortType.ASC)
                {
                    var dt = dataTable.Rows.Cast<DataRow>().OrderBy(r => r[colName].ToString().StrToObject(colType)).CopyToDataTable();
                    return dt;
                }
                else
                {
                    var dt = dataTable.Rows.Cast<DataRow>().OrderByDescending(r => r[colName].ToString().StrToObject(colType)).CopyToDataTable();
                    return dt;
                }
            }
            catch (Exception)
            {
                return null;
            }
        }

    }
}

三,使用示例

将上面的源码添加到项目中,然后在DataTable后使用即可。

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatatableSortDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add(new DataColumn("A"));
            dt.Columns.Add(new DataColumn("B"));
            dt.Columns.Add(new DataColumn("C"));
            dt.Columns.Add(new DataColumn("D"));

            dt.Rows.Add("字符串3", "2021-08-31 10:00:00", "1", "45.6");
            dt.Rows.Add("字符串2", "2020-08-31 10:00:00", "2", "23.7");
            dt.Rows.Add("字符串1", "2019-08-31 10:00:00", "3", "99");
            dt.Rows.Add("字符串4", "2021-08-31 11:00:00", "4", "12");
            dt.Rows.Add("字符串5", "2021-08-31 10:01:00", "5", "34.5");

            var d1 = dt.Sort("A", DatatableSort.ColumnType.STRING, DatatableSort.SortType.ASC);
            var d1_1 = dt.Sort("A", DatatableSort.ColumnType.STRING, DatatableSort.SortType.DESC);

            var d2 = dt.Sort("B", DatatableSort.ColumnType.DATETIME, DatatableSort.SortType.ASC);
            var d2_1 = dt.Sort("B", DatatableSort.ColumnType.DATETIME, DatatableSort.SortType.DESC);

            var d3 = dt.Sort("C", DatatableSort.ColumnType.INT, DatatableSort.SortType.ASC);
            var d3_1 = dt.Sort("C", DatatableSort.ColumnType.INT, DatatableSort.SortType.DESC);

            var d4 = dt.Sort("D", DatatableSort.ColumnType.DOUBLE, DatatableSort.SortType.ASC);
            var d4_1 = dt.Sort("D", DatatableSort.ColumnType.DOUBLE, DatatableSort.SortType.DESC);

            Console.WriteLine("按列A正序:");
            DatatablePrint(d1);
            Console.WriteLine("按列A倒序:");
            DatatablePrint(d1_1);
            Console.WriteLine("--------------------");
            Console.WriteLine("按列B正序:");
            DatatablePrint(d2);
            Console.WriteLine("按列B倒序:");
            DatatablePrint(d2_1);
            Console.WriteLine("--------------------");
            Console.WriteLine("按列C正序:");
            DatatablePrint(d3);
            Console.WriteLine("按列C倒序:");
            DatatablePrint(d3_1);
            Console.WriteLine("--------------------");
            Console.WriteLine("按列D正序:");
            DatatablePrint(d4);
            Console.WriteLine("按列D倒序:");
            DatatablePrint(d4_1);
            Console.WriteLine("--------------------");

            Console.ReadKey();
        }

        static void DatatablePrint(DataTable dt)
        {
            string s = "";
            int iColCount = dt.Columns.Count;
            foreach( DataColumn col in dt.Columns)
            {
                s += col.ColumnName + "\t";
            }
            Console.WriteLine(s);

            foreach (DataRow row in dt.Rows)
            {
                s = "";
                for(int i=0;i< dt.Columns.Count; i++)
                {
                    s += row[i].ToString() + "\t";
                }
                Console.WriteLine(s);
            }
        }


    }
}

四,运行结果

运行结果如下,排序都正确的。

image

-【END】-



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