Add IWebBrowser.LoadUrlWithPostData extension method (in WebBrowserEx…

…tensions) - simplifies calling LoadRequest

Add IPostData.AddData extension method (in PostDataExtensions)
WPF Example change from calling LoadRequest to using new LoadUrlWithPostData extension method

CefSharp.Wpf.Example/ViewModels/BrowserTabViewModel.cs

@@ -212,15 +212,9 @@ private void Go()
 
         public void LoadCustomRequestExample()
         {
-            var frame = WebBrowser.GetMainFrame();
+            var postData = System.Text.Encoding.Default.GetBytes("test=123&data=456");
 
-            //Create a new request knowing we'd like to use PostData
-            var request = frame.CreateRequest(initializePostData:true);
-            request.Method = "POST";
-            request.Url = "custom://cefsharp/PostDataTest.html";
-            request.PostData.AddData("test=123&data=456");
-
-            frame.LoadRequest(request);
+            WebBrowser.LoadUrlWithPostData("https://cefsharp.com/PostDataTest.html", postData);
         }
     }
 }

CefSharp/PostDataExtensions.cs

@@ -143,5 +143,24 @@ public static void AddData(this IPostData postData, string data, Encoding encodi
 
             postData.AddElement(element);
         }
+
+        /// <summary>
+        /// Add a new <see cref="IPostDataElement"/> that represents the key and value
+        /// </summary>
+        /// <param name="postData">Post Data</param>
+        /// <param name="bytes">byte array that represents the post data</param>
+        public static void AddData(this IPostData postData, byte[] bytes)
+        {
+            if (bytes == null)
+            {
+                throw new ArgumentNullException("bytes");
+            }
+
+            var element = postData.CreatePostDataElement();
+
+            element.Bytes = bytes;
+
+            postData.AddElement(element);
+        }
     }
 }

CefSharp/WebBrowserExtensions.cs

@@ -9,6 +9,7 @@
 using System.Globalization;
 using CefSharp.Internals;
 using System.IO;
+using System.Collections.Specialized;
 
 namespace CefSharp
 {
@@ -220,6 +221,40 @@ public static void ExecuteScriptAsync(this IWebBrowser browser, string script)
             }
         }
 
+        /// <summary>
+        /// Loads 
+        /// Creates a new instance of IRequest with the specified Url and Method = POST
+        /// </summary>
+        /// <param name="browser"></param>
+        /// <param name="url"></param>
+        /// <param name="postDataBytes"></param>
+        /// <param name="contentType"></param>
+        /// <remarks>This is an extension method</remarks>
+        public static void LoadUrlWithPostData(this IWebBrowser browser, string url, byte[] postDataBytes, string contentType = null)
+        {
+            using (var frame = browser.GetMainFrame())
+            {
+                ThrowExceptionIfFrameNull(frame);
+
+                //Initialize Request with PostData
+                var request = frame.CreateRequest(initializePostData:true);
+
+                request.Url = url;
+                request.Method = "POST";
+
+                request.PostData.AddData(postDataBytes);
+
+                if(!string.IsNullOrEmpty(contentType))
+                { 
+                    var headers = new NameValueCollection();
+                    headers.Add("Content-Type", contentType);
+                    request.Headers = headers;
+                }
+
+                frame.LoadRequest(request);
+            }
+        }
+
         /// <summary>
         /// Load the string contents with the specified dummy url. Web security restrictions may not behave as expected. 
         /// </summary>