asp.Net   发布时间:2019-10-06  发布网站:大佬教程  code.js-code.com
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如果缺少javascript或css文件,是否有可能收到异常?

我已经试过下面的代码,但它永远不会抛出异常…

public class BundleConfig {
    public static void RegisterBundles(BundleCollection bundles) {  
        ....

        bundles.Add(new ScriptBundle("~/bundles/something").Include("~/Scripts/nonExisTingFile.js"));
        // I would like the above usage of Include method with 
        // a non-exisTing file  to throw an exception to make it 
        // obvious that an expected file is missing ...
        // but since it does not I tried to implement a method as below ...
        ...
        AssertThatAllFilesExist(bundles);
        // but unfortunately an exception is never thrown but when 
        // iteraTing the files in the method below,// the non-exisTing file seems to never become retrieved ...
    }   

    private static void AssertThatAllFilesExist(BundleCollection bundles) {
        httpContext currenthttpContext = httpContext.Current;
        var httpContext = new httpContextWrapper(currenthttpContext);
        foreach (var bundle in bundles) {
            var bundleContext = new BundleContext(httpContext,bundles,bundle.Path);
            IEnumerable<FileInfo> files = bundle.EnumerateFiles(bundleContext);
            foreach (var file in files) {
                if (!file.Exists) {
                    // if this problem would occur then it should 
                    // inDicate that one of the arguments of the 
                    // method "Bundle.Include" does not 
                    // correspond to an exisTing file ...
                    throw new Argumentexception("The following file does not exist: " + file.FullName);
                }
            }
        }
    }
}

解决方法

我使用这个类而不是ScriptBundle:
public class ScriptBundleWithException : ScriptBundle
{
    public ScriptBundleWithException( String virtualPath ) : base( virtualPath ) {}
    public ScriptBundleWithException( String virtualPath,String cdnPath ) : base( virtualPath,cdnPath ) {}

    public override Bundle Include( params String[] virtualPaths )
    {
        foreach ( var virtualPath in virtualPaths ) {
            Include( virtualPath );
        }
        return this;
    }

    public override Bundle Include( String virtualPath,params IItemTransform[] transforms )
    {
        var realPath = System.Web.HosTing.HosTingEnvironment.MapPath( virtualPath );
        if ( !File.Exists( realPath ) ) {
            throw new FileNotFoundException( "Virtual path not found: " + virtualPath );
        }
        return base.Include( virtualPath,transforms );
    }
}

然后在配置中:

bundles.Add( new ScriptBundleWithException( "~/bundles/something" ) //...

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