c# - 错误 : 'Operand type clash: date is incompatible with int ' on date type

Question

我在 SQL Server 中有一个包含 date 数据类型列的表。

我想选择具有 ExpireDate >= Datetime.Now 的记录

我使用存储过程。

ALTER PROCEDURE [dbo].[Ad_SelectByCommand]
@Where varchar(max),
@SQLSort varchar(max)
AS
DECLARE @query varchar(max);

    IF @Where <> N'' SET @Where = N' WHERE ' + @Where
    IF @SQLSort <> N'' SET @SQLSort = N' ORDER BY ' + @SQLSort

SET @query = 'SELECT [Id], [Name], [Description], [Image], [ExpireDate], [Cost], [IsPayment] FROM [dbo].[Ad]' + @Where + @SQLSort

EXEC(@query)

并在 C# 中使用它:

var list = clsAdFactory.GetAllByCommand("ExpireDate>=" + DateTime.Now.ToShortDateString());

和

var list = clsAdFactory.GetAllByCommand("ExpireDate>=" + DateTime.Now.ToString("dd/MM/yyyy"));

但是我得到了错误

Operand type clash: date is incompatible with int

Answer 1

用引号括起日期:

string whereClause = string.Format(@"ExpireDate >= '{0}'", DateTime.Now.ToShortDateString());
var list = clsAdFactory.GetAllByCommand(whereClause);