Random seed = new Random();

MethodInfo getSyntax = typeof(UriParser).GetMethod("GetSyntax", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);

FieldInfo flagsField = typeof(UriParser).GetField("m_Flags", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

if (getSyntax != null && flagsField != null)

{

    foreach (string scheme in new[] { "http", "https" })

    {

       UriParser parser = (UriParser)getSyntax.Invoke(null, new object[] { scheme });

       if (parser != null)

       {

             int flagsValue = (int)flagsField.GetValue(parser);

                        // Clear the CanonicalizeAsFilePath attribute

             if ((flagsValue & 0x1000000) != )

                flagsField.SetValue(parser, flagsValue & ~0x1000000);

       }

    }

 }
 //使用

 var url = new Uri((mdishInfopic ?? "").Trim() + "?newDate=" + seed.NextDouble());