1.首先新建一个空的解决方案，并添加一个类库，代码如下，编译并生产dll

using System;
using System.Collections.Generic;
using System.Data.SqlTypes;
using System.Linq;
using System.Text;
namespace TEST
{
public class TestTrans
{
[Microsoft.SqlServer.Server.SqlFunction]
public static SqlString GenerateDecryptString(string name)
{
string decode = string.Empty;
decode = string.Format("HELLO WORLD {0}!", name);//DecryptString(dataXML.Value);
SqlString sqlValue = new SqlString(decode);
return sqlValue;
}
} <..