求助：如何在ASP.NET Web应用中禁用文本框自动完成功能

Hey there! I’ve battled this exact autocomplete problem in ASP.NET apps before, so I know how frustrating it is when standard blog solutions don’t work. Let’s go through the most reliable fixes that should get this sorted for you:

• Direct Control Attributes (Web Forms & HTML)
  For ASP.NET Web Forms TextBox controls, combine the built-in property with the HTML autocomplete attribute—some browsers ignore one or the other:

  <asp:TextBox ID="txtUserInput" runat="server" AutoCompleteType="Disabled" autocomplete="off"></asp:TextBox>
  

  If you’re using plain HTML inputs (or MVC), use either autocomplete="off" or autocomplete="new-password"—the latter works better for modern browsers like Chrome that sometimes bypass off:

  <input type="text" id="txtUserInput" name="txtUserInput" autocomplete="new-password" />
  

• Disable Autocomplete for Entire Forms
  If you want to turn off autocomplete for all controls in a form, add the attribute directly to the <form> tag:

  <form id="mainForm" runat="server" autocomplete="off">
      <!-- All your form controls here -->
  </form>
  

• JavaScript Workaround for Stubborn Browsers
  Some browsers cache autocomplete data based on control names/IDs. Use JavaScript to dynamically override these values on page load:

  document.addEventListener('DOMContentLoaded', function() {
      // Target all text and password inputs
      const inputs = document.querySelectorAll('input[type="text"], input[type="password"]');
      inputs.forEach(input => {
          input.setAttribute('autocomplete', 'off');
          // Add a random suffix to the name to break browser caching
          input.setAttribute('name', `${input.name}_${Math.random().toString(36).slice(2, 10)}`);
      });
  });
  

• ASP.NET MVC Helper Method
  If you’re using MVC, pass the autocomplete attribute directly in your TextBoxFor helper:

  @Html.TextBoxFor(m => m.UserInput, new { autocomplete = "off" })
  

A quick note: Modern browsers have gotten smarter about ignoring autocomplete="off" in certain scenarios (like login fields). If that’s your case, autocomplete="new-password" is often a better workaround, even for non-password fields—browsers won’t cache values marked with this.

内容的提问来源于stack exchange，提问作者Sourabh Tiwari