Question

我正在尝试在窗口对话框关闭后获取值：

public partial class MyDialogWindow: Window
{
    public string selectedItem = "";
    public MyDialogWindow(string selectedItem)
    {
        InitializeComponent();
        this.selectedItem = selectedItem;
    }

    ...
}


// To call dialog
string result = "";
MyDialogWindow dialog = new MyDialogWindow(result);
if (form.ShowDialog().Value)
{
   string res = result;
}

但'结果'总是空的。在winforms我可以得到这个结果，但在WPF中没有。那么如何在关闭后从窗口返回结果？

Answer 1

字符串不像C＃中那样工作 - 它们是不可变的。

您可以像其他人建议的那样使用ref关键字来实现此功能，但是这只有在构造函数中设置SelectedItem时才有效，这有点不太可能！

执行此操作的常规方法是让对话框在对话框中显示属性：

public partial class MyDialogWindow: Window
{
    public string SelectedItem
    {
        get;
        set;
    {

    // etc...
}

MyDialogWindow dialog = new MyDialogWindow(result);
if (form.ShowDialog().Value)
{
   string res = dialog.SelectedItem;
}

这是其他对话框（例如打开/保存文件对话框）的工作方式。

Answer 2

将公共属性添加到MyDialogWindow类，然后在返回ShowDialog（）后访问它。

   class MyDialogWindow
   {
       public string UserEnteredData { get; set; }
   }


   if (form.ShowDialog().Value) 
   {    
      string res = dialog.UserEnteredData; 
   }

Answer 3

这是我刚写的示例窗口：

public partial class ActionDialog : Window
{

    public ActionDialog(string msg)
    {
        InitializeComponent();
        MsgTbx.Text = msg;
    }

    //Record the user's click result
    public bool ClickResult = false;

    //In Other place need to use this Dialog just Call this Method
    public static bool EnsureExecute(string msg)
    {
        ActionDialog dialogAc = new ActionDialog(msg);
        //this line will run through only when dialogAc is closed
        dialogAc.ShowDialog(); 
        //the magic is the property ClickResult of dialogAc
        //can be accessed even when it's closed
        return dialogAc.ClickResult;
    }

    //add this method to your custom OK Button's click event        
    private void Execute_OnClick(object sender, RoutedEventArgs e)
    {
        ClickResult = true;
        this.Close();
    }

    //add this method to your custom Cancel Button click event       
    private void Cancel_OnClick(object sender, RoutedEventArgs e)
    {
        ClickResult = false;
        this.Close();
    }
}

调用Dialog时的代码：

//simply one line can get the user's Button Click Result
bool isExecute = ActionDialog.EnsureExecute(msg);

参考

https://social.msdn.microsoft.com/Forums/vstudio/en-US/a5cae559-ff8c-4cd8-9c76-4e5821c9aefb/wpf-window-return-value?forum=wpf

关闭窗口后返回结果

3 个答案: