ToPascalCase: first 1-char part to upper case

Conver string like 't_abc' to PascalCase as 'TAbc'

Author: shusen

src/EntityFrameworkCore.Generator.Core/Extensions/StringExtensions.cs

@@ -122,7 +122,7 @@ public static string ToPascalCase(this string value, Regex splitRegex)
                 }
                 else
                 {
-                    output.Append(name);
+                    output.Append(name.ToUpper());
                 }
             }
         }
@@ -140,4 +140,4 @@ public static string ToPascalCase(this string value, Regex splitRegex)
     }
 
 
-}
+}