Projektdateien hinzufügen.

VideoBrowser/Helpers/UrlHelper.cs

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+namespace VideoBrowser.Helpers
+{
+    using System;
+    using System.Web;
+
+    /// <summary>
+    /// Defines the <see cref="UrlHelper" />.
+    /// </summary>
+    internal static class UrlHelper
+    {
+        #region Methods
+
+        /// <summary>
+        /// The GetValidUrl.
+        /// </summary>
+        /// <param name="url">The url<see cref="string"/>.</param>
+        /// <returns>The <see cref="string"/>.</returns>
+        public static string GetValidUrl(string url)
+        {
+            if (!IsValidUrl(url))
+            {
+                var encodedUrl = HttpUtility.UrlEncode(url);
+                url = $"https://www.youtube.com/results?search_query={encodedUrl}";
+            }
+
+            return url;
+        }
+
+        /// <summary>
+        /// The IsValidUrl.
+        /// </summary>
+        /// <param name="url">The url<see cref="string"/>.</param>
+        /// <returns>The <see cref="bool"/>.</returns>
+        public static bool IsValidUrl(string url)
+        {
+            if (!url.Contains("."))
+            {
+                return false;
+            }
+
+            if (!url.Contains("http"))
+            {
+                url = $"http://{url}";
+            }
+
+            var result = Uri.TryCreate(url, UriKind.Absolute, out Uri uriResult)
+                && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
+            return result;
+        }
+
+        #endregion Methods
+    }
+}