FileOpenPicker：使用清单中的文件扩展名 [英] FileOpenPicker: use file extensions from manifest

问题描述

在应用程序清单中指定支持的文件扩展名后，我想知道如何访问此信息（甚至可以作为FileExtensionVector），以便我可以在FileOpenPicker中使用它。我无法在API中找到任何关于它的内容，但重复
此列表似乎不是很干。

After specifying supported file extensions in the application manifest, I wonder how to access this information (maybe as a FileExtensionVector even) so I can use it in the FileOpenPicker. I was unable to find anything about that in the API but duplicating this list doesn't seem very DRY.

推荐答案

我有一对几分钟，所以我想出了这个快速而又脏的代码。它的工作原理，但API中的一个不依赖于清单结构的方法当然会更好。

I had a couple of minutes to spare, so I came up with this quick and dirty code. It works but a method in the API that doesn't depend on the structure of the manifest would still be nicer of course.

  readExtensionsFromManifestAsync = function() {
    var applicationPath = Package.current.installedLocation.path;
    return StorageFile.getFileFromPathAsync(applicationPath + '\\package.appxmanifest').then(function(manifest) {
      return XmlDocument.loadFromFileAsync(manifest).then(function(doc) {
        var extensions, node, nodes, _i, _len;
        extensions = [];
        nodes = doc.selectNodesNS('descendant::mf:SupportedFileTypes/mf:FileType/text()', 'xmlns:mf="http://schemas.microsoft.com/appx/2010/manifest"');
        for (_i = 0, _len = nodes.length; _i < _len; _i++) {
          node = nodes[_i];
          extensions.push(node.nodeValue);
        }
        return extensions;
      });
    });
  };

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