Security Exception - Trying to load MySite Blog

Question

When I try to run this async query it fails:

    private void SomeFunction()
    {
        Thread thread = new Thread(GetBlogInfo);
        thread.Start();
    }

    private void GetBlogInfo()
    {
        this.clientContext = new ClientContext(this.strMySiteBlogUrl);
        this.oWeb = this.clientContext.Web;
        this.clientContext.Load(this.oWeb);

        this.oList = this.oWeb.Lists.GetByTitle("Posts");
        this.clientContext.Load(this.oList);
        CamlQuery query = new CamlQuery();
        query.ViewXml = "<View><Query><OrderBy><FieldRef Name='PublishedDate' Ascending='FALSE'></FieldRef>" +
            "</OrderBy></Query><ViewFields><FieldRef Name='Title'/><FieldRef Name='Body'/>" +
            "<FieldRef Name='PublishedDate'/></ViewFields><RowLimit>1</RowLimit></View>";
        this.oListInfo = this.oList.GetItems(query);
        this.clientContext.Load(this.oListInfo);
        this.clientContext.ExecuteQueryAsync(onQuerySucceeded, onQueryFailed);
    }

This is within a Silverlight Application, fyi. I thought it was a threading issue, but it just says:

• Exception {System.Security.SecurityException ---> System.Security.SecurityException: Security error. at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) at System.Net.Browser.BrowserHttpWebRequest.<>c_DisplayClassa.b_9(Object sendState) at System.Net.Browser.AsyncHelper.<>c_DisplayClass4.b_1(Object sendState) --- End of inner exception stack trace --- at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at Microsoft.SharePoint.Client.ClientContext.OnGetResponse(IAsyncResult asyncResult)} System.Exception {System.Security.SecurityException}

Any ideas?

Answer 1

Configuring the ClientAccessPolicy.xml solved my problem.

There is a sample on this page:

http://www.dev4side.com/community/blog/2010/8/15/security-error-using-sharepoint-2010-client-object-model-for-silverlight.aspx

And best practice guidelines for production here:

http://msdn.microsoft.com/en-us/library/cc645032(VS.95).aspx