wpf - WPF：创建对话框/提示

Question

我需要创建一个对话框/提示，包括用于用户输入的 TextBox。我的问题是，确认对话后如何获取文本？通常我会为此创建一个类，它将文本保存在属性中。但是我想使用 XAML 设计对话框。所以我必须以某种方式扩展 XAML 代码以将 TextBox 的内容保存在一个属性中——但我想这对于纯 XAML 是不可能的。实现我想做的最好的方法是什么？如何构建一个可以从 XAML 定义但仍能以某种方式返回输入的对话框？感谢您的任何提示！

score 152 · Accepted Answer

“负责任”的答案是我建议为对话框构建一个 ViewModel 并在 TextBox 上使用双向数据绑定，以便 ViewModel 具有一些“ResponseText”属性或其他属性。这很容易做到，但可能有点矫枉过正。

务实的答案是只给你的文本框一个 x:Name 以便它成为一个成员并将文本作为属性暴露在你的代码后面的类中，如下所示：

<!-- Incredibly simplified XAML -->
<Window x:Class="MyDialog">
   <StackPanel>
       <TextBlock Text="Enter some text" />
       <TextBox x:Name="ResponseTextBox" />
       <Button Content="OK" Click="OKButton_Click" />
   </StackPanel>
</Window>

然后在你的代码后面......

partial class MyDialog : Window {

    public MyDialog() {
        InitializeComponent();
    }

    public string ResponseText {
        get { return ResponseTextBox.Text; }
        set { ResponseTextBox.Text = value; }
    }

    private void OKButton_Click(object sender, System.Windows.RoutedEventArgs e)
    {
        DialogResult = true;
    }
}

然后使用它...

var dialog = new MyDialog();
if (dialog.ShowDialog() == true) {
    MessageBox.Show("You said: " + dialog.ResponseText);
}

score 40 · Accepted Answer

编辑：可以使用 nuget https://www.nuget.org/packages/PromptDialog/安装

我只是添加了一个静态方法来像 MessageBox 一样调用它：

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    x:Class="utils.PromptDialog"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    WindowStartupLocation="CenterScreen" 
    SizeToContent="WidthAndHeight"
    MinWidth="300"
    MinHeight="100"
    WindowStyle="SingleBorderWindow"
    ResizeMode="CanMinimize">
<StackPanel Margin="5">
    <TextBlock Name="txtQuestion" Margin="5"/>
    <TextBox Name="txtResponse" Margin="5"/>
    <PasswordBox Name="txtPasswordResponse" />
    <StackPanel Orientation="Horizontal" Margin="5" HorizontalAlignment="Right">
        <Button Content="_Ok" IsDefault="True" Margin="5" Name="btnOk" Click="btnOk_Click" />
        <Button Content="_Cancel" IsCancel="True" Margin="5" Name="btnCancel" Click="btnCancel_Click" />
    </StackPanel>
</StackPanel>
</Window>

以及背后的代码：

public partial class PromptDialog : Window
{
    public enum InputType
    {
        Text,
        Password
    }

    private InputType _inputType = InputType.Text;

    public PromptDialog(string question, string title, string defaultValue = "", InputType inputType = InputType.Text)
    {
        InitializeComponent();
        this.Loaded += new RoutedEventHandler(PromptDialog_Loaded);
        txtQuestion.Text = question;
        Title = title;
        txtResponse.Text = defaultValue;
        _inputType = inputType;
        if (_inputType == InputType.Password)
            txtResponse.Visibility = Visibility.Collapsed;
        else
            txtPasswordResponse.Visibility = Visibility.Collapsed;
    }

    void PromptDialog_Loaded(object sender, RoutedEventArgs e)
    {
        if (_inputType == InputType.Password)
            txtPasswordResponse.Focus();
        else
            txtResponse.Focus();
    }

    public static string Prompt(string question, string title, string defaultValue = "", InputType inputType = InputType.Text)
    {
        PromptDialog inst = new PromptDialog(question, title, defaultValue, inputType);
        inst.ShowDialog();
        if (inst.DialogResult == true)
            return inst.ResponseText;
        return null;
    }

    public string ResponseText
    {
        get
        {
            if (_inputType == InputType.Password)
                return txtPasswordResponse.Password;
            else
                return txtResponse.Text;
        }
    }

    private void btnOk_Click(object sender, RoutedEventArgs e)
    {
        DialogResult = true;
        Close();
    }

    private void btnCancel_Click(object sender, RoutedEventArgs e)
    {
        Close();
    }
}

所以你可以这样称呼它：

string repeatPassword = PromptDialog.Prompt("Repeat password", "Password confirm", inputType: PromptDialog.InputType.Password);

score 17 · Accepted Answer

乔希的回答很好，这一切都归功于他，但是我稍微修改了一下：

MyDialog Xaml

    <StackPanel Margin="5,5,5,5">
        <TextBlock Name="TitleTextBox" Margin="0,0,0,10" />
        <TextBox Name="InputTextBox" Padding="3,3,3,3" />
        <Grid Margin="0,10,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button Name="BtnOk" Content="OK" Grid.Column="0" Margin="0,0,5,0" Padding="8" Click="BtnOk_Click" />
            <Button Name="BtnCancel" Content="Cancel" Grid.Column="1" Margin="5,0,0,0" Padding="8" Click="BtnCancel_Click" />
        </Grid>
    </StackPanel>

MyDialog 代码背后

    public MyDialog()
    {
        InitializeComponent();
    }

    public MyDialog(string title,string input)
    {
        InitializeComponent();
        TitleText = title;
        InputText = input;
    }

    public string TitleText
    {
        get { return TitleTextBox.Text; }
        set { TitleTextBox.Text = value; }
    }

    public string InputText
    {
        get { return InputTextBox.Text; }
        set { InputTextBox.Text = value; }
    }

    public bool Canceled { get; set; }

    private void BtnCancel_Click(object sender, System.Windows.RoutedEventArgs e)
    {
        Canceled = true;
        Close();
    }

    private void BtnOk_Click(object sender, System.Windows.RoutedEventArgs e)
    {
        Canceled = false;
        Close();
    }

并在其他地方调用它

var dialog = new MyDialog("test", "hello");
dialog.Show();
dialog.Closing += (sender,e) =>
{
    var d = sender as MyDialog;
    if(!d.Canceled)
        MessageBox.Show(d.InputText);
}

score 4 · Accepted Answer

您不需要任何其他花哨的答案。下面是一个简单的示例，它没有在 XAML 中设置所有Margin, Height,Width属性，但应该足以说明如何在基本级别完成此操作。

XAML像往常一样
构建一个页面并向其中添加字段，例如 a和a中的控件：WindowLabelTextBoxStackPanel

<StackPanel Orientation="Horizontal">
    <Label Name="lblUser" Content="User Name:" />
    <TextBox Name="txtUser" />
</StackPanel>

然后为提交创建一个标准Button（“确定”或“提交”）和一个“取消”按钮，如果你喜欢：

<StackPanel Orientation="Horizontal">
    <Button Name="btnSubmit" Click="btnSubmit_Click" Content="Submit" />
    <Button Name="btnCancel" Click="btnCancel_Click" Content="Cancel" />
</StackPanel>

代码
隐藏您将在代码隐藏中添加Click事件处理函数，但是当您到那里时，首先声明一个公共变量，您将在其中存储您的文本框值：

public static string strUserName = String.Empty;

然后，对于事件处理函数（右键单击ClickXAML 按钮上的函数，选择“转到定义”，它将为您创建它），您需要检查您的框是否为空。如果不是，则将其存储在变量中，然后关闭窗口：

private void btnSubmit_Click(object sender, RoutedEventArgs e)
{        
    if (!String.IsNullOrEmpty(txtUser.Text))
    {
        strUserName = txtUser.Text;
        this.Close();
    }
    else
        MessageBox.Show("Must provide a user name in the textbox.");
}

从另一个页面调用它
你在想，如果我在上面关闭窗口this.Close()，我的价值就消失了，对吧？ 不！！我从另一个网站发现了这一点： http ://www.dreamincode.net/forums/topic/359208-wpf-how-to-make-simple-popup-window-for-input/

他们有一个与此类似的示例（我对其进行了一些清理），说明如何Window从另一个打开您的并检索值：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void btnOpenPopup_Click(object sender, RoutedEventArgs e)
    {
        MyPopupWindow popup = new MyPopupWindow();  // this is the class of your other page

        //ShowDialog means you can't focus the parent window, only the popup
        popup.ShowDialog(); //execution will block here in this method until the popup closes

        string result = popup.strUserName;
        UserNameTextBlock.Text = result;  // should show what was input on the other page
    }
}

取消按钮
你在想，那么那个取消按钮呢？因此，我们只需在弹出窗口代码隐藏中添加另一个公共变量：

public static bool cancelled = false;

让我们包含我们的btnCancel_Click事件处理程序，并对以下内容进行一项更改btnSubmit_Click：

private void btnCancel_Click(object sender, RoutedEventArgs e)
{        
    cancelled = true;
    strUserName = String.Empty;
    this.Close();
}

private void btnSubmit_Click(object sender, RoutedEventArgs e)
{        
    if (!String.IsNullOrEmpty(txtUser.Text))
    {
        strUserName = txtUser.Text;
        cancelled = false;  // <-- I add this in here, just in case
        this.Close();
    }
    else
        MessageBox.Show("Must provide a user name in the textbox.");
}

然后我们在MainWindow btnOpenPopup_Click事件中读取该变量：

private void btnOpenPopup_Click(object sender, RoutedEventArgs e)
{
    MyPopupWindow popup = new MyPopupWindow();  // this is the class of your other page
    //ShowDialog means you can't focus the parent window, only the popup
    popup.ShowDialog(); //execution will block here in this method until the popup closes

    // **Here we find out if we cancelled or not**
    if (popup.cancelled == true)
        return;
    else
    {
        string result = popup.strUserName;
        UserNameTextBlock.Text = result;  // should show what was input on the other page
    }
}

回复很长，但我想展示使用public static变量是多么容易。不DialogResult，没有返回值，什么都没有。只需打开窗口，将您的值与弹出窗口中的按钮事件一起存储，然后在主窗口函数中检索它们。

wpf - WPF：创建对话框/提示

4 回答 4

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