C# 无法将“System.Int64”类型的对象强制转换为“System.Int32”类型

在中请求相同类型的字符串时获取错误

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)");     
}

参数都是字符串，并且在SQL Server NVARCHA13中都是字符串

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是什么原因造成的？

您的代码没有问题。您需要仔细检查上下文是否与对象正确映射

要比较不带大小写的字符串，请使用

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

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发布您的订单转移model@FarhadZamani string@AmeerPappayDone显示完整的错误消息您正在使用实体框架吗？