XAFApplication 模型属性意外未设置。尝试为 .net core6 (XAF) 设置自定义模板

Question

我需要为我的 .net 核心 xaf 项目设置模板表单。如上所述here

所以我引用了一个包含我的模板表单的框架 4.8 项目。在我的 .net6 program.cs

中使用以下代码

try
{
    winApplication.CreateCustomTemplate += delegate (object sender, CreateCustomTemplateEventArgs e)
    {
        // fails here 
        bool isRibbon = ((IModelOptionsWin)e.Application.Model.Options).FormStyle == RibbonFormStyle.Ribbon;
        if (isRibbon && e.Context == TemplateContext.View)
        {
            e.Template = new DetailRibbonForm2(); // the form is in the framework project
        }
    };

    winApplication.Setup();
    winApplication.Start();
}
catch (Exception e)
{
    MessageBox.Show($"Error. inner: {e.InnerException} e:{e.ToString()}");

    winApplication.StopSplash();
    winApplication.HandleException(e);
}

错误堆栈为

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=MyApp.Win
  StackTrace:
   at MyApp.Win.Program.<>c.<Main>b__0_0(Object sender, CreateCustomTemplateEventArgs e) in D:\dev\MyApp\MyApp.Win\Program.cs:line 93
   at DevExpress.ExpressApp.XafApplication.RaiseCreateCustomTemplate(CreateCustomTemplateEventArgs args)
   at DevExpress.ExpressApp.Win.WinApplication.PreCreateCustomTemplate(TemplateContext context)
   at DevExpress.ExpressApp.Win.WinApplication.InitializeFrameTemplateCache()
   at DevExpress.ExpressApp.Win.WinApplication.SetupCore(String applicationName, IList`1 objectSpaceProviders, ApplicationModulesManager modulesManager, ISecurityStrategyBase security)
   at DevExpress.ExpressApp.XafApplication.Setup(String applicationName, IList`1 objectSpaceProviders, ApplicationModulesManager modulesManager, ISecurityStrategyBase security)
   at DevExpress.ExpressApp.XafApplication.Setup(String applicationName, IList`1 objectSpaceProviders, String[] moduleAssemblies, ISecurityStrategyBase security)
   at DevExpress.ExpressApp.XafApplication.Setup(String applicationName, String connectionString, String[] moduleAssemblies, ISecurityStrategyBase security)
   at DevExpress.ExpressApp.XafApplication.Setup()
   at MyApp.Win.Program.Main() in D:\dev\MyApp\MyApp.Win\Program.cs:line 101

  This exception was originally thrown at this call stack:
    MyApp.Win.Program.Main.AnonymousMethod__0_0(object, DevExpress.ExpressApp.CreateCustomTemplateEventArgs) in Program.cs
    DevExpress.ExpressApp.XafApplication.RaiseCreateCustomTemplate(DevExpress.ExpressApp.CreateCustomTemplateEventArgs)
    DevExpress.ExpressApp.Win.WinApplication.PreCreateCustomTemplate(DevExpress.ExpressApp.TemplateContext)
    DevExpress.ExpressApp.Win.WinApplication.InitializeFrameTemplateCache()
    DevExpress.ExpressApp.Win.WinApplication.SetupCore(string, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider>, DevExpress.ExpressApp.ApplicationModulesManager, DevExpress.ExpressApp.Security.ISecurityStrategyBase)
    DevExpress.ExpressApp.XafApplication.Setup(string, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider>, DevExpress.ExpressApp.ApplicationModulesManager, DevExpress.ExpressApp.Security.ISecurityStrategyBase)
    DevExpress.ExpressApp.XafApplication.Setup(string, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider>, string[], DevExpress.ExpressApp.Security.ISecurityStrategyBase)
    DevExpress.ExpressApp.XafApplication.Setup(string, string, string[], DevExpress.ExpressApp.Security.ISecurityStrategyBase)
    DevExpress.ExpressApp.XafApplication.Setup()
    MyApp.Win.Program.Main() in Program.cs

[更新]

申请不为空

Application.Model 为空

从 Framework example 中的工作代码我认为我应该安全地将 winApplication.CreateCustomTemplate 的框架代码复制到我的 xaf .net 核心应用程序中。

然而，空引用异常表明在 .net 核心中是不同的

[更新] 我将框架示例转换为 .net6，它可以正常工作。现在找出我的项目失败的原因

在工作项目中 winApplication.Setup() 不会触发 CreateCustomTemplate 事件。导致事件触发的良好调用堆栈是

CustomizeRibbonTemplateExample.Win.dll!CustomizeRibbonTemplateExample.Win.Program.Main.AnonymousMethod__0_0(object sender, DevExpress.ExpressApp.CreateCustomTemplateEventArgs e) Line 38   C#
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.RaiseCreateCustomTemplate(DevExpress.ExpressApp.CreateCustomTemplateEventArgs args)    Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.OnCreateCustomTemplate(string name)    Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.CreateTemplate(string templateContextName) Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.Frame.CreateTemplate()    Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinWindow.WinWindow(DevExpress.ExpressApp.XafApplication application, DevExpress.ExpressApp.TemplateContext context, System.Collections.Generic.ICollection<DevExpress.ExpressApp.Controller> controllers, bool isMain, bool activateControllersImmediately)  Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.CreateWindowCore(DevExpress.ExpressApp.TemplateContext context, System.Collections.Generic.ICollection<DevExpress.ExpressApp.Controller> controllers, bool isMain, bool activateControllersImmediately)    Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.CreateWindow(DevExpress.ExpressApp.TemplateContext context, System.Collections.Generic.ICollection<DevExpress.ExpressApp.Controller> controllers, bool createAllControllers, bool isMain, DevExpress.ExpressApp.View view) Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinShowViewStrategyBase.CreateWindow(DevExpress.ExpressApp.ShowViewParameters parameters, DevExpress.ExpressApp.ShowViewSource showViewSource, bool isMain)   Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinShowViewStrategyBase.CreateExplorerWindow(DevExpress.ExpressApp.ShowViewParameters parameters) Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinShowViewStrategyBase.ShowStartupWindowCore()   Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.MdiShowViewStrategy.ShowStartupWindowCore()   Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinShowViewStrategyBase.ShowStartupWindow()   Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.ShowStartupWindow()    Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.DoStartupLogic(DevExpress.XtraSplashScreen.IOverlaySplashScreenHandle overlayFormHandle)   Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.Start()    Unknown
CustomizeRibbonTemplateExample.Win.dll!CustomizeRibbonTemplateExample.Win.Program.Main() Line 46    C#

在糟糕的项目中 winApplication.Setup 确实会导致事件触发。错误的调用堆栈是

MyApp.Win.dll!MyApp.Win.Program.Main.AnonymousMethod__0_0(object sender, DevExpress.ExpressApp.CreateCustomTemplateEventArgs e) Line 92 C#
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.RaiseCreateCustomTemplate(DevExpress.ExpressApp.CreateCustomTemplateEventArgs args)    Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.PreCreateCustomTemplate(DevExpress.ExpressApp.TemplateContext context) Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.InitializeFrameTemplateCache() Unknown
DevExpress.ExpressApp.Win.v21.2.dll!DevExpress.ExpressApp.Win.WinApplication.SetupCore(string applicationName, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider> objectSpaceProviders, DevExpress.ExpressApp.ApplicationModulesManager modulesManager, DevExpress.ExpressApp.Security.ISecurityStrategyBase security)    Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.Setup(string applicationName, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider> objectSpaceProviders, DevExpress.ExpressApp.ApplicationModulesManager modulesManager, DevExpress.ExpressApp.Security.ISecurityStrategyBase security)    Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.Setup(string applicationName, System.Collections.Generic.IList<DevExpress.ExpressApp.IObjectSpaceProvider> objectSpaceProviders, string[] moduleAssemblies, DevExpress.ExpressApp.Security.ISecurityStrategyBase security) Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.Setup(string applicationName, string connectionString, string[] moduleAssemblies, DevExpress.ExpressApp.Security.ISecurityStrategyBase security)   Unknown
DevExpress.ExpressApp.v21.2.dll!DevExpress.ExpressApp.XafApplication.Setup()    Unknown
MyApp.Win.dll!MyApp.Win.Program.Main() Line 101 C#

所以看起来在错误的程序中 winApplication.Setup 导致事件触发，而在好的程序中 winApplication.Start 导致事件触发。

现在我需要尝试进入 winApplication.Setup 但我似乎在 pdb 文件中缺少 XafApplication.cs。我问过 here.

[更新] 我觉得区别可能就在这里

事实证明，在良好的调用堆栈中，以下内容是正确的

if (RunSetupInNewThread && (SplashScreen == null || SplashScreen is DXSplashScreen))

Answer 1

通过删除我的 SplashScreen.cs，我能够让 winApplication.Setup 走上幸福的道路。

Answer 2

它是 What is a NullReferenceException, and how do I fix it? 的副本，可以轻松调试，因为您的自定义代码中会出现 NullReferenceException (MyApp.Win.Program.<>c.b__0_0(Object sender , CreateCustomTemplateEventArgs e) 在 D:\dev\MyApp\MyApp.Win\Program.cs:line 93).

正确的解决方案是遵循 Create a Custom Ribbon Template 上针对此特定场景的 DevExpress 文档中的最佳实践，并添加以下检查 e.Application.Model != null。这并非特定于 .NET 5、6 或 .NET Framework。

XAFApplication 模型属性意外未设置。尝试为 .net core6 (XAF) 设置自定义模板

XAFApplication model property unexpectedly not set. Trying to set custom template for .net core6 (XAF)

c#

xaf

winforms

.net-core

.net-4.8

XAFApplication 模型 属性 意外未设置。尝试为 .net core6 (XAF) 设置自定义模板

XAFApplication model property unexpectedly not set. Trying to set custom template for .net core6 (XAF)

c#

xaf

winforms

.net-core

.net-4.8

XAFApplication 模型属性意外未设置。尝试为 .net core6 (XAF) 设置自定义模板