无法将类型'system.data.datatable'隐式转换为'int'，我该如何纠正? [英] Cannot implicitly convert type 'system.data.datatable' to 'int' how do I rectify it?

问题描述

Cannot implicitly convert type ''System.Data.DataTable'' to ''int''

我正在3层架构中进行操作.

我尝试过的事情:

I''m doing it in 3 tier architecture.

What I have tried:

public int Doctor_appointment(query qr)
{
    cmd.Parameters.AddWithValue("@Name", qr.Name);
    cmd.Parameters.AddWithValue("@Place", qr.Place);
    cmd.Parameters.AddWithValue("@Date", qr.Date);
    cmd.Parameters.AddWithValue("@Time", qr.Time);
    DataTable r = extablestore("Doctor_Page_appointment", cmd);
    return r ;
}

推荐答案

查看方法定义:

Look at the method definition:

public int Doctor_appointment(query qr)

现在看看您要返回的内容:

Now look at what you are trying to return:

DataTable r = extablestore("Doctor_Page_appointment", cmd);
return r ;

数据表可能包含许多整数，并且具有一些返回整数值的属性和方法:系统不知道您要返回哪个值，也无法猜测.
可能您想返回数据表，因此将您的方法定义更改为:

A datatable may contains many integers, and has several properties and methods that return integer values: the system does not know which value you want to return and cannot guess.
Probably, you want to return the datatable, so change your method definition to:

public DataTable Doctor_appointment(query qr)

但是，如果不了解系统的其余部分，我们就无法告诉-因此请看一下如何使用该方法并做出决定.

But without intimate knowledge of the rest of your system we can''t tell - so look at how you are going to use the method and decide.

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