在cs中书写
using System;
using System.Data;
using System.Data.Sql;
using System.Data.SqlTypes;
using System.Data;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
 [Microsoft.SqlServer.Server.SqlFunction]
 public static SqlString Function1()
 {
  // Put your code here
  return new SqlString("Hello");
 }

 [SqlFunction]
 public static string ClrSplitter(string list, int element)
 {
  return list.Split(';')[element];
 }
};
使用
EXEC sp_configure 'show advanced options','1';
go

reconfigure;
go

EXEC sp_configure 'clr enabled','1' //打开执行clr功能，默认是关闭的
go

select dbo.ClrSplitter('Hello;world',1)