Add prefix string in URL string

Question

User input the url string in a textbox and I need to add a string "cmd" if not available .

Please suggest how to achieve this,

string cmdUrl = AddPrefix("https://google.com"); static string AddPrefix(string inputUrl) { return formattedUrl;// want to return https://cmd.google.com if the string cmd not added already in url }

There's functionality for parsing a URL/URI into its component parts and then manipulating it. Did you do any research for built in methods to do that in .NET? — mason
– mason, Commented May 5, 2022 at 13:15

Lukas Hein · Accepted Answer · 2022-05-05 13:27:17Z

First, you can parse your url using var parsedUrl = new Uri(inputUrl). Then check if the host includes your substring like this: parsedUrl.Host.StartsWith("cmd") If it does, return your original url else build your new one: $"{parsedUrl.Scheme}://cmd.{parsedUrl.Host}{parsedUrl.PathAndQuery}"

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