C＃错误：运算符'=='不能应用于'System.Windows.Forms.DialogResult'和'bool'类型的操作数， [英] C# error: Operator '==' cannot be applied to operands of type 'System.Windows.Forms.DialogResult' and 'bool'

问题描述

在Visual Studio C＃Express上，当我运行下面的脚本时，在线上出现以下错误消息：

On Visual Studio C# Express when I run the script below, I get the following error message on the line saying:

if ofd.ShowDialog（）== true）：
错误1运算符'=='不能应用于类型为'System.Windows.Forms.DialogResult'和'bool'的操作数

if (ofd.ShowDialog() == true): Error 1 Operator '==' cannot be applied to operands of type 'System.Windows.Forms.DialogResult' and 'bool'

我怎么能解决这个问题？代码如下：

How could I solve this? Code below:

public override GH_ObjectResponse RespondToMouseDoubleClick(GH_Canvas sender, GH_CanvasMouseEvent e)
{
    System.Windows.Forms.OpenFileDialog ofd = new  System.Windows.Forms.OpenFileDialog();
    ofd.Multiselect = true;

    ofd.Filter = "Data Sources (*.ini)|*.ini*|All Files|*.*";
    if (ofd.ShowDialog() == true)
    {
        string[] filePath = ofd.FileNames;
        string[] safeFilePath = ofd.SafeFileNames;
    }
    return base.RespondToMouseDoubleClick(sender, e);
}

推荐答案

我怀疑你已经阅读 WPF OpenFileDialog.ShowDialog 文档方法结果是 Nullable< bool> 。但是，如果您使用的是 Windows窗体 OpenFileDialog.ShowDialog ，它返回 DialogResult code> - 你显然无法与 bool 进行比较。

I suspect you've been reading the WPF OpenFileDialog.ShowDialog documentation where the method result is Nullable<bool>. If, however, you're using Windows Forms OpenFileDialog.ShowDialog, that returns DialogResult - which you clearly can't compare with bool.

看看 DialogResult 并看看你实际上想要做什么。请注意，文档声明：

Have a look at DialogResult and see what you actually want to do. Note that the documentation claims:

返回：DialogResult.OK，如果用户在对话框中单击确定;否则，DialogResult.Cancel。

Return: DialogResult.OK if the user clicks OK in the dialog box; otherwise, DialogResult.Cancel.

...所以这些应该是唯一需要考虑的情况。

... so those should be the only cases you need to consider.

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