Question

我想在检索时显示一个包含用户友好消息的进度对话框数据。我正在使用visual studio 2010.我尝试使用此代码

/// <summary>
    /// Shows a progress message to the user.
    /// </summary>
    /// <param name="header">The header text for the dialog.</param>
    /// <param name="message">The message to be displayed in the dialog.</param>
    void ShowProgressMessage(string header, string message)
    {
        _isMessageDialogVisible = true;

        _controller = _metroWindow.ShowProgressAsync(header, message);
    }

    /// <summary>
    /// Closes a message dialog that is visible.
    /// </summary>
    void CloseProgressMessage()
    {
        if (_isMessageDialogVisible)
        {
            _isMessageDialogVisible = false;
            if (null != _controller)
            {
                var controller = _controller.Result;
                controller.CloseAsync();
            }
        }
    }

但它会出错：

22 09 2015 [9] DEBUG - OPGSpiral Error App.AppDispatcherUnhandledException --- System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.

at MahApps.Metro.Controls.Dialogs.BaseMetroDialog.HandleTheme（）在MahApps.Metro.Controls.Dialogs.BaseMetroDialog.Initialize（）在MahApps.Metro.Controls.Dialogs.BaseMetroDialog..ctor（MetroWindow owningWindow，MetroDialogSettings设置）在MahApps.Metro.Controls.Dialogs.ProgressDialog..ctor（MetroWindow parentWindow，MetroDialogSettings设置）在MahApps.Metro.Controls.Dialogs.ProgressDialog..ctor（MetroWindow parentWindow）在MahApps.Metro.Controls.Dialogs.DialogManager。＆lt;＆gt; c__DisplayClass43.b__3b（） ---内部异常堆栈跟踪结束--- at System.RuntimeMethodHandle.InvokeMethod（Object target，Object [] arguments，Signature sig，Boolean constructor） at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal（Object obj，Object [] parameters，Object [] arguments）在System.Delegate.DynamicInvokeImpl（Object [] args）在System.Windows.Threading.ExceptionWrapper.InternalRealCall（委托回调，对象args，Int32 numArgs）在System.Windows.Threading.ExceptionWrapper.TryCatchWhen（Object source，Delegate callback，Object args，Int32 numArgs，Delegate catchHandler） 22 09 2015 [9]调试 - OPGSpiral错误App.AppDispatcherUnhandledException --- System.Reflection.TargetInvocationException：调用目标抛出了异常。 ---＆GT; System.NullReferenceException：未将对象引用设置为对象的实例。在MahApps.Metro.Controls.Dialogs.BaseMetroDialog.HandleTheme（）在MahApps.Metro.Controls.Dialogs.BaseMetroDialog.Initialize（）在MahApps.Metro.Controls.Dialogs.BaseMetroDialog..ctor（MetroWindow owningWindow，MetroDialogSettings设置）在MahApps.Metro.Controls.Dialogs.ProgressDialog..ctor（MetroWindow parentWindow，MetroDialogSettings设置）在MahApps.Metro.Controls.Dialogs.ProgressDialog..ctor（MetroWindow parentWindow）在MahApps.Metro.Controls.Dialogs.DialogManager。＆lt;＆gt; c__DisplayClass43.b__3b（） ---内部异常堆栈跟踪结束--- at System.RuntimeMethodHandle.InvokeMethod（Object target，Object [] arguments，Signature sig，Boolean constructor） at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal（Object obj，Object [] parameters，Object [] arguments）在System.Delegate.DynamicInvokeImpl（Object [] args）在System.Windows.Threading.ExceptionWrapper.InternalRealCall（委托回调，对象args，Int32 numArgs） at System.Windows.Threading.ExceptionWrapper.TryCatchWhen（Object source，Delegate callback，Object args，Int32 numArgs，Delegate catchHandler）

Answer 1

这应该在1.2.2中修复，可以通过NuGet获得。

Visual Studio 2010中的mahapps对话框

1 个答案: