从子窗口传递到父窗口

Question

我想问一下，

我有一个叫做MainWindow的窗口，另一个叫ImportForm 。 在MainWindow我打电话

private void generate_Window(int num_chart) 
{ 
    Window ownedWindow = new ImportForm(num_chart); 
    ownedWindow.Owner = this;      
    ownedWindow.Show(); 
}

在子窗口中，我做一些东西，并产生一些变量。 像var1，var2，var3。

我想要在子窗口关闭时将var1 ， var2 ， var3返回到MainWindow并调用一个函数，例如import_chart(var1, var2, var3) 。

任何帮助将被取消。 谢谢

Answer 1

似乎是一个尴尬的设计选择。 无论如何，这是您可以执行的操作：

MainWindow.cs：

private void generate_Window(int num_chart)
{
    Window ownedWindow = new ImportForm(num_chart, import_chart); 
    ownedWindow.Owner = this; 
    ownedWindow.Show();
}

private void import_chart(int n, string s, bool b)
{
    //Do something
}

ImportForm.cs：

private Action<int, string, bool> callback;
public ImportForm(int num_chart, Action<int, string, bool> action)
{
    InitializeComponent();
    Closed += ImportForm_Closed;
    callback = action;
}

private void ImportForm_Closed(object sender, EventArgs e)
{
    callback(0, "Test", false);
}

只需将Action更改为所需的参数类型（并调整ImportForm_Closed（...）即可使用它们）。

如果有任何不清楚的地方，请通知我。

Answer 2

如何将事件添加到ImportForm“ ImportFinished”中，在此您将值作为eventargs传递。 此事件在ImportForm的Close或Closing事件中触发，并在您的MainWindow中处理。 您还可以将ImportForm显示为模态对话框，并在ShowDialog方法返回时读取值。

Answer 3

一种简单的方法是使var1 ， var2和var3实例变量在父级范围内可见（例如，将它们设为public ），然后在MainWindow ，附加到Closed事件，并从中读取变量(ImportForm)sender 。

Answer 4

我有一个自己的代码示例。 它很通用，很明显，我可以在这里分享。

我已经按照这些原则做了一些事情。

    /// <summary>
    /// Show an InputBox similar to the pre-.NET InputBox functionality. Returns the original value when Cancel was pressed.
    /// </summary>
    /// <param name="OriginalValue">Pre-populated value in the input box</param>
    /// <param name="PromptText">Prompt text displayed on the form</param>
    /// <param name="Caption">Window caption</param>
    /// <returns>InputBoxResult structure containing both the DialogResult and the input text. Warning: The input text will always be returned regardless of the DialogResult, so don't use it if the DialogResult is Cancel.</returns>
    public static InputBoxResult Show(string OriginalValue = "", string PromptText = "", string Caption = "") {
        InputBox form = new InputBox {
           Text = Caption,
            lblPrompt = {Text = PromptText}, 
            txtInput = {Text = OriginalValue}
        };

        InputBoxResult res = new InputBoxResult();
        res.Result = form.ShowDialog();
        res.Input = form.txtInput.Text;

        return res;
    }

我创建了一个名为InputBoxResult的类，如下所示：

    /// <summary>
    /// Represents the results from an InputBox.Show call, including the DialogResult
    /// and the input data. Note that the input data is always populated with the
    /// user-entered data regardless of the DialogResult - this is inconsistent with
    /// the old InputBox behavior and may change in the future.
    /// </summary>
    public struct InputBoxResult {
        /// <summary>
        /// Describes the way the dialog was resolved (OK / Cancel)
        /// </summary>
        public DialogResult Result { get; set; }
        /// <summary>
        /// User-entered text
        /// </summary>
        public string Input { get; set; }

        /// <summary>
        /// Translate this result into a string for easy debugging
        /// </summary>
        /// <returns></returns>
        public override string ToString() {
            return "Result: " + Result.ToString() +
                "\r\nInput: " + Input.ToString();
        }
    }