如何获取导入的MEF函数的汇编信息？

发布于 2024-09-25 13:40:48 字数 449 浏览 6 评论 0原文

是否可以从导入的 MEF 函数中获取程序集信息？我需要知道包含该函数的插件控件的程序集版本和名称。尝试了以下方法，但它只返回 System.ComponentModel.Composition 版本。

foreach (Lazy<Func<int>, IMetadata> func in PluginFuncs)
{
    // get assembly information of the Plugin control for the imported function 
    string version = func.GetType().Assembly.GetName().Version.ToString();
    Console.WriteLine(version);
}

另一种选择是在元数据中使用硬编码值，但我认为这不可维护。当版本更改时，很容易忘记更改这些值。

原文

Is it possible get the assembly information from an imported MEF function? I need to know the assembly version and name of the Plugin control that contains the function. Tried the following, but it just returns the System.ComponentModel.Composition version.

foreach (Lazy<Func<int>, IMetadata> func in PluginFuncs)
{
    // get assembly information of the Plugin control for the imported function 
    string version = func.GetType().Assembly.GetName().Version.ToString();
    Console.WriteLine(version);
}

Another alternative would be to use hardcoded values in the metadata, but I thought this would not be maintainable. It would be easy to forget to change those values when the version changed.

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别念他 2024-10-02 13:40:48

您需要从 func.Value 内部检查类型，而不是包装它的 Lazy 。尝试：

Func<int> lambdaFunc = func.Value;
Delegate del = lambdaFunc;
string version = del.Method.ReflectedType.Assembly.GetName().Version.ToString();

但是，请意识到这将在此时评估 Lazy - 但这是必需的，因为在评估该对象之前，您尝试获取类型的对象尚未构造完毕。

You need to check the type from within func.Value, not the Lazy<T,TMeta> wrapping it. Try:

Func<int> lambdaFunc = func.Value;
Delegate del = lambdaFunc;
string version = del.Method.ReflectedType.Assembly.GetName().Version.ToString();

However, realize that this will evaluate the Lazy<T> at this point - but this is required, because the object where you are trying to get the type hasn't be constructed until you evaluate that.

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