无法将类型为“ System.Int64”的对象转换为类型为“ System.Int32”的对象

Question

在输入相同类型的字符串时出现错误

var orderTransferFromDb = await context.OrderTransfer.FirstOrDefaultAsync(t =>
t.ToMemberMobilePhone.ToUpperInvariant().Equals(mobilePhone.ToUpperInvariant()));

public async Task<bool> UpdateOrderTransferToMemberId(string mobilePhone, string memberid)
{
    if (mobilePhone != null)
    {
        using (var context = ContextManager.ClubContext())
        {
            var orderTransferFromDb = await context.OrderTransfer.FirstOrDefaultAsync(t => t.ToMemberMobilePhone.ToUpperInvariant().Equals(mobilePhone.ToUpperInvariant()));
            if (orderTransferFromDb != null)
            {
                context.Attach(orderTransferFromDb);
                orderTransferFromDb.ToMemberId = memberid;
                await context.SaveChangesAsync();
            }
            return true;
        }
    }
    throw new Exception("MobilePhone is null. (UpdteOrderTransferByEmail)");     
}

参数都是string，并且在SQL Server nvarchar(13)中

什么原因引起的？

Answer 1

您的代码没有错。您需要仔细检查上下文是否与对象正确映射。

要比较不区分大小写的字符串，请使用此

var orderTransferFromDb = await context.OrderTransfer.FirstOrDefaultAsync(t => string.Equals(t.ToMemberMobilePhone, mobilePhone, StringComparison.OrdinalIgnoreCase));