无法确定调用者的应用程序身份? [英] Unable to determine application identity of the caller?

问题描述

我正在 VS2010 中为 Windows Phone 编写 Silverlight 透视应用程序.我刚刚添加了来自 msdn here.现在每次我重新加载设计器时都会出现异常:

I'm writing a Silverlight pivot app in VS2010 for Windows Phone. I just added the example code from msdn here. Now every time I reload the designer I get an exception:

无法确定调用者的应用程序身份.

Unable to determine application identity of the caller.

在 System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type appEvidenceType)

at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type appEvidenceType)

在 System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope scope, Type applicationEvidenceType)

at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope scope, Type applicationEvidenceType)

在 System.IO.IsolatedStorage.IsolatedStorageSettings.get_ApplicationSettings()在 C:..Settings.cs:line 34

at System.IO.IsolatedStorage.IsolatedStorageSettings.get_ApplicationSettings() at SettingsSample.AppSettings..ctor() in C:..Settings.cs:line 34

这是 Visual Studio/Windows Phone SDK 中的错误吗?

Is this a bug in Visual Studio/Windows Phone SDK?

这是第 34 行构造函数中的代码:

This is the code in the constructor at line 34:

public AppSettings()
    {
        // Get the settings for this application.
        try
        {
            settings = IsolatedStorageSettings.ApplicationSettings;
        }
        catch (System.Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

我添加了 try-catch 以查看发生了什么.

I added the try-catch to see what was going on.

我怀疑 Visual Studio(调用方)正在尝试运行代码，但没有关联的应用程序(应用程序标识)，所以它失败了.也许?

I suspect that Visual Studio(the caller) is attempting to run the code but there is no application(application identity) associated, so it fails. Maybe?

有什么想法吗?

推荐答案

您需要添加一个检查到 DesignerProperties.IsInDesignTool 到该代码，因为访问 Visual Studio 或 Expression Blend 中的 IndependentStorageSettings 无效.

You need to add a check to DesignerProperties.IsInDesignTool to that code since accessing IsolatedStorageSettings in Visual Studio or Expression Blend is invalid.

if (!System.ComponentModel.DesignerProperties.IsInDesignTool)
{
     settings = IsolatedStorageSettings.ApplicationSettings; 
}

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