MessageDialog 類別

參考

定義

命名空間:: Windows.UI.Popups

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

編輯

表示對話方塊，用來向使用者顯示訊息。

在傳統型應用程式中，在以顯示 UI 的方式使用這個類別的實例之前，您必須將物件與其擁有者的視窗控制碼產生關聯。如需詳細資訊和程式碼範例，請參閱顯示相依于 CoreWindow 的 WinRT UI 物件。

重要

只有在升級使用 MessageDialog 的通用 Windows 8.x 應用程式時，才應該使用 MessageDialog，而且需要將變更降至最低，或者您的應用程式不是 XAML 時。針對 Windows 10+ 中的新 XAML 應用程式，建議您改用ContentDialog控制項。

public ref class MessageDialog sealed

/// [Windows.Foundation.Metadata.Activatable(Windows.UI.Popups.IMessageDialogFactory, 65536, Windows.Foundation.UniversalApiContract)]
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
class MessageDialog final

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
/// [Windows.Foundation.Metadata.Activatable(Windows.UI.Popups.IMessageDialogFactory, 65536, "Windows.Foundation.UniversalApiContract")]
class MessageDialog final

[Windows.Foundation.Metadata.Activatable(typeof(Windows.UI.Popups.IMessageDialogFactory), 65536, typeof(Windows.Foundation.UniversalApiContract))]
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
public sealed class MessageDialog

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Standard)]
[Windows.Foundation.Metadata.Activatable(typeof(Windows.UI.Popups.IMessageDialogFactory), 65536, "Windows.Foundation.UniversalApiContract")]
public sealed class MessageDialog

function MessageDialog(content, title)

Public NotInheritable Class MessageDialog

繼承: Object Platform::Object IInspectable MessageDialog

屬性: ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute

Windows 需求

裝置系列	Windows 10 (已於 10.0.10240.0 引進)
API contract	Windows.Foundation.UniversalApiContract (已於 v1.0 引進)

範例

下列範例示範如何將命令新增至訊息對話方塊並加以顯示。如需完整的程式碼範例，請參閱訊息對話方塊範例。

using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
using SDKTemplate;
using System;

private async void CancelCommandButton_Click(object sender, RoutedEventArgs e)
{
    // Create the message dialog and set its content
    var messageDialog = new MessageDialog("No internet connection has been found.");

    // Add commands and set their callbacks; both buttons use the same callback function instead of inline event handlers
    messageDialog.Commands.Add(new UICommand(
        "Try again", 
        new UICommandInvokedHandler(this.CommandInvokedHandler)));
    messageDialog.Commands.Add(new UICommand(
        "Close", 
        new UICommandInvokedHandler(this.CommandInvokedHandler)));

    // Set the command that will be invoked by default
    messageDialog.DefaultCommandIndex = 0;

    // Set the command to be invoked when escape is pressed
    messageDialog.CancelCommandIndex = 1;

    // Show the message dialog
    await messageDialog.ShowAsync();
}

private void CommandInvokedHandler(IUICommand command)
{
    // Display message showing the label of the command that was invoked
    rootPage.NotifyUser("The '" + command.Label + "' command has been selected.", 
        NotifyType.StatusMessage);
}

// MainPage.cpp
#include "pch.h"
#include "MainPage.h"

#include <winrt/Windows.UI.Popups.h>

#include "winrt/Windows.System.h"
#include "winrt/Windows.UI.Xaml.Controls.h"
#include "winrt/Windows.UI.Xaml.Input.h"
#include "winrt/Windows.UI.Xaml.Navigation.h"
#include <sstream>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::UI::Xaml;
...
void MainPage::CancelCommandButton_Click(IInspectable const&, RoutedEventArgs const&)
{
    // Create the message dialog and set its content
    Windows::UI::Popups::MessageDialog msg{ L"No internet connection has been found." };

    // Add commands and set their callbacks.
    // Both commands use the same callback function instead of inline event handlers.
    Windows::UI::Popups::UICommand continueCommand{
        L"Try again",
        { this, &MainPage::CommandInvokedHandler} };
    Windows::UI::Popups::UICommand upgradeCommand{
        L"Close",
        { this, &MainPage::CommandInvokedHandler } };

    // Add the commands to the dialog.
    msg.Commands().Append(continueCommand);
    msg.Commands().Append(upgradeCommand);

    // Set the command that will be invoked by default.
    msg.DefaultCommandIndex(0);

    // Set the command to be invoked when escape is pressed.
    msg.CancelCommandIndex(1);

    // Show the message dialog.
    msg.ShowAsync();
}

void MainPage::CommandInvokedHandler(Windows::UI::Popups::IUICommand const& command)
{
    // Display message.
    std::wstringstream stringstream;
    stringstream << L"The '" << command.Label().c_str() << L"' command has been selected.";
    rootPage.NotifyUser(stringstream.str().c_str(), NotifyType::StatusMessage);
}

#include "pch.h"
#include "CancelCommand.xaml.h"

using namespace MessageDialogSample;

using namespace Windows::UI::Popups;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Navigation;

void MessageDialogSample::CancelCommand::CancelCommandButton_Click(Platform::Object^ sender,
    Windows::UI::Xaml::RoutedEventArgs^ e)
{
    // Create the message dialog and set its content
    MessageDialog^ msg = ref new MessageDialog("No internet connection has been found.");

    // Add commands and set their callbacks.
    // Both commands use the same callback function instead of inline event handlers.
    UICommand^ continueCommand = ref new UICommand(
        "Try again", 
        ref new UICommandInvokedHandler(this, &CancelCommand::CommandInvokedHandler));
    UICommand^ upgradeCommand = ref new UICommand(
        "Close", 
        ref new UICommandInvokedHandler(this, &CancelCommand::CommandInvokedHandler));

    // Add the commands to the dialog
    msg->Commands->Append(continueCommand);
    msg->Commands->Append(upgradeCommand);

    // Set the command that will be invoked by default
    msg->DefaultCommandIndex = 0;

    // Set the command to be invoked when escape is pressed
    msg->CancelCommandIndex = 1;

    // Show the message dialog
    msg->ShowAsync();
}

void CancelCommand::CommandInvokedHandler(Windows::UI::Popups::IUICommand^ command)
{
    // Display message
    rootPage->NotifyUser("The '" + command->Label + "' command has been selected.", 
        NotifyType::StatusMessage);
}

Imports Windows.UI.Popups
Imports Windows.UI.Xaml
Imports Windows.UI.Xaml.Controls
Imports Windows.UI.Xaml.Navigation
Imports SDKTemplate

Partial Public NotInheritable Class CloseCommand
    Inherits SDKTemplate.Common.LayoutAwarePage

    ' A pointer back to the main page.  This is needed if you want to call methods in MainPage such
    ' as NotifyUser()
    Private rootPage As MainPage = MainPage.Current

    Public Sub New()
        Me.InitializeComponent()
    End Sub

    Private Async Sub CloseCommandLaunch_Click(sender As Object, e As RoutedEventArgs)
        ' Create the message dialog and set its content and title
        Dim messageDialog = New MessageDialog("No internet connection has been found.")

        ' Add buttons and set their callbacks
        messageDialog.Commands.Add(New UICommand("Try again", Sub(command)
            rootPage.NotifyUser("The '" & command.Label & "' button has been selected.", _ 
                NotifyType.StatusMessage)
                                                              End Sub))

        messageDialog.Commands.Add(New UICommand("Close", Sub(command) 
            rootPage.NotifyUser("The '" & command.Label & "' button has been selected.", _
                NotifyType.StatusMessage)
                                                          End Sub))

        ' Set the command that will be invoked by default
        messageDialog.DefaultCommandIndex = 0

        ' Set the command to be invoked when escape is pressed
        messageDialog.CancelCommandIndex = 1

        ' Show the message dialog
        Await messageDialog.ShowAsync
    End Sub
End Class

備註

注意

這個類別不是敏捷式的，這表示您需要考慮其執行緒模型和封送處理行為。如需詳細資訊，請參閱執行緒和封送處理 (C++/CX) 和在多執行緒環境中使用 Windows 執行階段物件 (.NET) 。

對話方塊有一個命令列，最多可支援傳統型應用程式中的三個命令，或行動應用程式中的兩個命令。如果您未指定任何命令，則會新增預設命令以關閉對話方塊。對話方塊會將畫面後方的螢幕變暗，並封鎖觸控事件，使其無法傳遞至應用程式的畫布，直到使用者回應為止。

訊息對話方塊應該謹慎使用，而且僅適用于必須封鎖使用者流程的重要訊息或簡單問題。以下是 範例區 段中程式碼所建立對話方塊的範例。

建構函式

MessageDialog(String)

初始化 MessageDialog 類別的新實例，以顯示可用來詢問使用者簡單問題的未命名訊息對話方塊。

對話方塊會將畫面後方變暗，並封鎖觸控事件傳遞至應用程式的畫布，直到使用者回應為止。

訊息對話方塊應該謹慎使用，而且僅適用于必須封鎖使用者流程的重要訊息或簡單問題。

MessageDialog(String, String)

初始化 MessageDialog 類別的新實例，以顯示標題消息對話方塊，可用來詢問您的使用者簡單問題。

屬性

CancelCommandIndex	取得或設定您想要用來作為取消命令的命令索引。這是使用者按下 ESC 鍵時所引發的命令。在您設定索引之前，請先新增命令。
Commands	取得出現在訊息對話方塊命令列中的命令陣列。這些命令可讓對話方塊採取動作。取得此陣列，並新增代表命令的 UICommand 物件。如果對話方塊目前顯示，則不會將命令新增至命令列。
Content	取得或設定要向使用者顯示的訊息。
DefaultCommandIndex	取得或設定您想要作為預設值之命令的索引。這是使用者按下 ENTER 鍵時預設引發的命令。在您設定索引之前，請先新增命令。
Options	取得或設定 MessageDialog的選項。
Title	取得或設定對話方塊上要顯示的標題，如果有的話。

方法

ShowAsync()

開始顯示對話方塊的非同步作業。

適用於

共用方式為

MessageDialog 類別

定義

Windows 需求

範例

備註

建構函式

屬性

方法

適用於

另請參閱

意見反應

其他資源