How can I do with URL add extra Character?

Question

I create a controller,contain a method Index.

When I go to website , click the button of this controller.

Why my URL will extra some Character.

when I delete the extra Character, it can Successful operation,

but I don't know how to solve this problem.

I have check _Layout.cshtml . But i didn't find anything woring. When I click the Link of GatewaySettingDevices. The URL will go to http://localhost:10007/%20GatewaySettingDevices What is the %20?

This is my _Layout.cshtml code

<li class="nav-item">
 <a class="nav-link text-dark" asp-area="" asp-controller="GatewaySettingClouds" asp-action="Index">GatewaySettingClouds</a>
 </li>
<li class="nav-item">
 <a class="nav-link text-dark" asp-area="" asp-controller=" GatewaySettingDevices" asp-action="Index"> GatewaySettingDevices</a>
 </li>

Answer 1

What is the %20

Answer: Its a white space before " GatewaySettingDevices" controller name. You have to remove that.

From your code it seems that everything is fine, but the reason for adding extra character on your request is asp-controller=" GatewaySettingDevices"

You could see there is a white sprace before " GatewaySettingDevices" Just get rid of the white space and it should look like below:

<li class="nav-item">
 <a class="nav-link text-dark" asp-area="" asp-controller="GatewaySettingClouds" asp-action="Index">GatewaySettingClouds</a>
 </li>
<li class="nav-item">
 <a class="nav-link text-dark" asp-area="" asp-controller="GatewaySettingDevices" asp-action="Index"> GatewaySettingDevices</a>
 </li>

Hope it would resolve your problem. Let me know if the problem still persists