Embedding a JS file in Silverlight Class Library

I a开发者_高级运维m trying to create a Silverlight class library which needs to call a few Javascript methods. I have put these methods in a single .js file and have added it to the project. But when I try to call any of the methods in the js file, I get a FailedtoInvoke error. I understand that this problem can be solved by adding a reference of the JS file in the head section of ASPX or HTML page. But I am developing a class library and so that is not possible. Does someone know how to tackle this issue? I am using Silverlight 4 and Visual Studio 2010.

Add the .js file to your library probject as it sounds you have done, make sure it Build Action is "Resource".

You can retrieve this content with Application.GetResourceStream :-

StreamResourceInfo sriJS = Application.GetResourceStream(new Uri("YourAssemblyName;component/MyStuff.js", UriKind.Relative));

Note the structure of the Uri, the assembly name of your class library is needed followed by the literal ";component". This tells Silverlight to look for a resource inside your dll that will be included in a final application's Xap.

Now you need to turn the content of the info's Stream property into a string:-

StreamReader reader = new StreamReader(sriJS.Stream, System.Text.Encoding.UTF8);
string js = reader.ReadToEnd();

Finally you can inject that javascript into the current page with:-

HtmlPage.Window.Eval(js);

Thats it, any global functions defined in the js may now be invoked with HtmlPage.Window.Invoke.

Try something like:

string myScriptCodeString = GetScriptCodeStringFromSomewhere();
System.Windows.Browser.HtmlPage.Window.Eval(myScriptCodeString);

Then the methods defined in myScriptCodeString should be available.