MEF 和 DirectoryCatalog

发布于 2024-11-25 06:30:04 字数 508 浏览 1 评论 0原文

有没有办法安全地使用 DirectoryCatalog 来处理目录不存在的情况？

这是我的容器如何设置的代码示例：

    //Create an assembly catalog of the assemblies with exports
    var catalog = new AggregateCatalog(
        new AssemblyCatalog(Assembly.GetExecutingAssembly()),
        new AssemblyCatalog(Assembly.Load("My.Second.Assembly")),
        new DirectoryCatalog("Plugins", "*.dll"));

    //Create a composition container
    var container = new CompositionContainer(catalog);

但是如果目录不存在，则会引发异常，我想忽略该错误。

原文

Is there a way to safely use DirectoryCatalog to handle if the directory doesn't exist?

Here a code example of how my container is setup:

    //Create an assembly catalog of the assemblies with exports
    var catalog = new AggregateCatalog(
        new AssemblyCatalog(Assembly.GetExecutingAssembly()),
        new AssemblyCatalog(Assembly.Load("My.Second.Assembly")),
        new DirectoryCatalog("Plugins", "*.dll"));

    //Create a composition container
    var container = new CompositionContainer(catalog);

But an exception is thrown if the directory doesn't exist, and I would like to ignore that error.

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柠北森屋 2024-12-02 06:30:04

如果抛出异常，显然不会。只需在运行 MEF 容器设置之前创建目录，就不会抛出任何错误。

根据文档：

路径必须是绝对路径或相对于 AppDomain .BaseDirectory.

进行目录检查的伪代码：

    string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Plugins");

    //Check the directory exists
    if (!Directory.Exists(path))
    {
        Directory.CreateDirectory(path);
    }

    //Create an assembly catalog of the assemblies with exports
    var catalog = new AggregateCatalog(
        new AssemblyCatalog(Assembly.GetExecutingAssembly()),
        new AssemblyCatalog(Assembly.Load("My.Other.Assembly")),
        new DirectoryCatalog(path, "*.dll"));

    //Create a composition container
    _container = new CompositionContainer(catalog);

Apparently not if an exception is thrown. Just create the directory prior to running the MEF container setup and then no error will be thrown.

According to the documentation:

The path must be absolute or relative to AppDomain.BaseDirectory.

PsuedoCode to do a directory check:

    string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Plugins");

    //Check the directory exists
    if (!Directory.Exists(path))
    {
        Directory.CreateDirectory(path);
    }

    //Create an assembly catalog of the assemblies with exports
    var catalog = new AggregateCatalog(
        new AssemblyCatalog(Assembly.GetExecutingAssembly()),
        new AssemblyCatalog(Assembly.Load("My.Other.Assembly")),
        new DirectoryCatalog(path, "*.dll"));

    //Create a composition container
    _container = new CompositionContainer(catalog);

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