将属性添加到DataColumn

using System;
using System.Data;

class Program
{
    static void Main()
    {
        // 创建一个新的DataTable实例
        DataTable table = new DataTable("Customers");

        // 创建一个新的DataColumn实例
        DataColumn column = new DataColumn("ID");

        // 将属性添加到DataColumn中
        column.ExtendedProperties.Add("Description", "Customer ID");
        column.ExtendedProperties.Add("DataType", typeof(int));
        column.ExtendedProperties.Add("MaxLength", 10);

        // 将DataColumn添加到DataTable中
        table.Columns.Add(column);

        // 输出DataColumn的属性
        Console.WriteLine("Description: {0}", column.ExtendedProperties["Description"]);
        Console.WriteLine("DataType: {0}", column.ExtendedProperties["DataType"]);
        Console.WriteLine("MaxLength: {0}", column.ExtendedProperties["MaxLength"]);
    }
}