Projektdateien hinzufügen.

VideoBrowser/Controls/CefSharpBrowser/Helpers/UrlHelper.cs

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+namespace VideoBrowser.Controls.CefSharpBrowser.Helpers
+{
+    using System;
+    using System.Globalization;
+    using System.Net;
+
+    /// <summary>
+    /// Defines the <see cref="UrlHelper" />.
+    /// </summary>
+    public static class UrlHelper
+    {
+        #region Methods
+
+        /// <summary>
+        /// The IsImageUrl.
+        /// </summary>
+        /// <param name="URL">The URL<see cref="string"/>.</param>
+        /// <returns>The <see cref="bool"/>.</returns>
+        public static bool IsImageUrl(this string URL)
+        {
+            if (!(HttpWebRequest.Create(URL) is HttpWebRequest req))
+            {
+                return false;
+            }
+
+            req.Method = "HEAD";
+            try
+            {
+                using (var resp = req.GetResponse())
+                {
+                    return resp.ContentType.ToLower(CultureInfo.InvariantCulture).StartsWith("image/");
+                }
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
+
+        #endregion Methods
+    }
+}