Use new API

Author: JunTaoLuo

src/Microsoft.AspNetCore.Http.Abstractions/HostString.cs

@@ -98,7 +98,7 @@ public int? Port
                 {
                     return null;
                 }
-                
+
                 return p;
             }
         }

src/Microsoft.AspNetCore.Http/Internal/ParsingHelpers.cs

@@ -411,12 +411,11 @@ private static string DeQuote(string value)
                 throw new ArgumentNullException(nameof(headers));
             }
 
-            const NumberStyles styles = NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite;
             long value;
             var rawValue = headers[HeaderNames.ContentLength];
             if (rawValue.Count == 1 &&
                 !string.IsNullOrWhiteSpace(rawValue[0]) &&
-                long.TryParse(rawValue[0], styles, CultureInfo.InvariantCulture, out value))
+                HeaderUtilities.TryParseInt64(new StringSegment(rawValue[0]).Trim(), out value))
             {
                 return value;
             }

src/Microsoft.Net.Http.Headers/ContentDispositionHeaderValue.cs

@@ -104,13 +104,13 @@ public long? Size
             get
             {
                 var sizeParameter = NameValueHeaderValue.Find(_parameters, SizeString);
-                ulong value;
+                long value;
                 if (sizeParameter != null)
                 {
-                    string sizeString = sizeParameter.Value;
-                    if (UInt64.TryParse(sizeString, NumberStyles.Integer, CultureInfo.InvariantCulture, out value))
+                    var sizeString = sizeParameter.Value;
+                    if (HeaderUtilities.TryParseInt64(sizeString, out value))
                     {
-                        return (long)value;
+                        return value;
                     }
                 }
                 return null;