将可空的guid传递给存储过程

Question

当我在我的c#代码中将可空的guid参数传递给存储过程时.我得到例外:

System.Data.SqlClient.SqlException(0x80131904):'@customerGuid'附近的语法不正确.

var userNameSqlParam = new SqlParameter
{
    ParameterName = "userName",
    Value = userName,
    DbType = DbType.String
};

var customerGuidSqlParam = new SqlParameter
{
    ParameterName = "customerGuid",
    Value = customerGuid,
    DbType = DbType.Guid
};

var rows = _dbContext.Database
    .SqlQuery<CurrentUserContextWithoutCustomer>
        ("EXEC [dbo].[GetCurrentUserContext] @userName @customerGuid",
        userNameSqlParam, customerGuidSqlParam)
    .ToList();

因此,当我通过SQL事件探查器查看我得到的内容时

exec sp_executesql 
N'EXEC [dbo].[GetCurrentUserContext] @userName @customerGuid',
N'@userName nvarchar(4),@customerGuid uniqueidentifier',
@userName=N'gir1',@customerGuid=default

我在查询结束时看到默认值.它会产生问题.有存储过程的标题

ALTER PROCEDURE [dbo].[GetCurrentUserContext]
    @userName nvarchar(100),
    @customerGuid uniqueidentifier
AS

如何将可空的guid作为存储过程参数传递给sql.

Answer 1

首先你应该发送一个DBNull.Value而不是null

var customerGuidSqlParam = new SqlParameter
{
    ParameterName = "customerGuid",
    Value = (object)customerGuid ?? (object)DBNull.Value,
    DbType = DbType.Guid
};

并且您在查询中错过了逗号.

var rows = _dbContext.Database
    .SqlQuery<CurrentUserContextWithoutCustomer>
        ("EXEC [dbo].[GetCurrentUserContext] @userName, @customerGuid",
        userNameSqlParam, customerGuidSqlParam)
    .ToList();