這個方法比較簡單，用Microsoft.VisualBasic命名空間下強大的字符串處理函數就可以了
c#代碼如下，編譯為BigConvertor.dll
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復制代碼 代碼如下:

using System;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction ]
    public static SqlString BigToGB(SqlString inString)
    {
        if (inString.IsNull) return SqlString .Null;
        return (Microsoft.VisualBasic.Strings .StrConv(inString.Value, Microsoft.VisualBasic.VbStrConv .SimplifiedChinese, 0));
    }
     [Microsoft.SqlServer.Server.SqlFunction ]
    public static SqlString GBToBig(SqlString inString)
    {
        if (inString.IsNull) return SqlString .Null;
        return (Microsoft.VisualBasic.Strings .StrConv(inString.Value, Microsoft.VisualBasic.VbStrConv .TraditionalChinese, 0));
    }
};

復制代碼 代碼如下:

CREATE ASSEMBLY BigConvertor FROM 'E:/sqlclrdata/BigConvertor.dll' WITH PERMISSION_SET = UnSAFE;
--
go
CREATE FUNCTION dbo. xfn_BigToGB 
(  
    @value nvarchar ( max )
)    
RETURNS nvarchar ( max )
AS EXTERNAL NAME BigConvertor. UserDefinedFunctions. BigToGB
go
CREATE FUNCTION dbo. xfn_GBToBig 
(  
    @value nvarchar ( max )
)    
RETURNS nvarchar ( max )
AS EXTERNAL NAME BigConvertor. UserDefinedFunctions. GBToBig

go