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社区首页 >问答首页 >XAFApplication模型属性意外未设置。尝试为.net core6 (XAF)设置自定义模板

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

Stack Overflow用户
提问于 2022-03-15 06:53:34
回答 2查看 200关注 0票数 0

我需要为我的.net核心xaf项目设置一个模板表单。如所述，这里

因此，我引用了一个框架4.8项目，其中包含了我的模板表单。在我的.net6 program.cs中使用以下代码

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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);
}

错误堆栈是

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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

应用程序不为空。

Application.Model为空

从框架实例中的工作代码来看，我认为应该安全地将winApplication.CreateCustomTemplate的框架代码复制到xaf .net核心应用程序中。

然而，空引用异常表明在.net内核中是不同的。

Update I将框架示例转换为.net6，并按其应有的方式工作。现在来找出我的项目失败的原因

在工作项目中，winApplication.Setup()不会导致触发CreateCustomTemplate事件。导致事件触发的好调用堆栈是

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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。坏调用堆栈是

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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#

因此，在坏程序中，winApplication.Setup会导致事件触发，而在好程序中，winApplication.Start会导致事件触发。

现在我需要尝试进入winApplication.Setup，但是我似乎在pdb文件中缺少了XafApplication.cs。我已经问过了，这里。

最新消息我想区别可能就在这里

​

​

结果表明，在好调用堆栈中，以下内容是正确的

代码语言：javascript
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if (RunSetupInNewThread && (SplashScreen == null || SplashScreen is DXSplashScreen))

​

​

xaf
c#
winforms
.net-core
.net-4.8
EN

Stack Overflow用户

回答已采纳

发布于 2022-03-16 22:07:19

它是什么是NullReferenceException，我如何修复它？的副本，可以很容易地调试，因为NullReferenceException出现在您的自定义代码( D:\dev\MyApp\MyApp.Win\Program.cs:line 93中的MyApp.Win.Program.<>c.b___0(对象发送方，CreateCustomTemplateEventArgs e)中)。

正确的解决方案是在DevExpress上遵循创建自定义条带模板文档中针对这个特定场景的最佳实践，并添加以下检查e.Application.Model != null。这并不是.NET 5、6或.NET框架所特有的。

​

​

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页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/71478069

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