InvalidCastException: 将参数值从 SqlParameter 转换到 Guid 失败。]

Question

            //执行含参数的存储过程
            System.Data.Common.DbParameter[] parasphoto = { 
                                                        new System.Data.SqlClient.SqlParameter("@EmployeeId",System.Data.DbType.Guid)      
                                                              };
            parasphoto[0].Value = "D35F313D-7322-4989-BB23-1C96130D61DF";            Response.Write(_db.ExecuteScalar("GetEmployeePhoto", parasphoto));ALTER PROCEDURE [dbo].[GetEmployeePhoto]
(
@EmployeeId uniqueidentifier
)AS
    SELECT Photo FROM Employees WHERE EmployeeId=@EmployeeId
    
RETURN [InvalidCastException: 对象必须实现 IConvertible。]
   System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +7598841
   System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType) +4872946[InvalidCastException: 将参数值从 SqlParameter 转换到 Guid 失败。]如上所示，请教大家

Answer 1

parasphoto[0].Value = new Gudi("D35F313D-7322-4989-BB23-1C96130D61DF");

Answer 2

将参数值从 SqlParameter 转换到 Guid 失败
无法转换吧？ 用1L试试