ASP.Net 域自动登录（AD自动登录）

ASP.NET 域自动登录（AD自动登录）可以让用户在访问Web应用程序时无需再次输入他们的凭据。它允许用户在他们的计算机上通过Windows身份验证登录，并自动通过ASP.NET应用程序进行身份验证。

以下是实现ASP.NET域自动登录（AD自动登录）的步骤：

1. 在Web.config文件中启用Windows身份验证：

<authentication mode="Windows" />

2. 在Global.asax文件中添加以下代码：

protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{
    if (HttpContext.Current.User != null)
    {
        if (HttpContext.Current.User.Identity.IsAuthenticated)
        {
            if (HttpContext.Current.User.Identity is WindowsIdentity)
            {
                // Get the Windows identity.
                var windowsIdentity = (WindowsIdentity)HttpContext.Current.User.Identity;

                // Get the user name and domain name.
                var userName = windowsIdentity.Name;
                var domainName = windowsIdentity.Name.Split('\\')[0];

                // Authenticate the user against Active Directory.
                if (AuthenticateUser(userName, domainName))
                {
                    // Create a new identity using the user name and domain name.
                    var identity = new GenericIdentity(userName, "Windows");

                    // Get the roles for the user from Active Directory.
                    var roles = GetRolesForUser(userName, domainName);

                    // Attach the roles to the identity.
                    HttpContext.Current.User = new GenericPrincipal(identity, roles);
                }
                else
                {
                    // Redirect the user to the login page.
                    FormsAuthentication.RedirectToLoginPage();
                }
            }
        }
    }
}

private bool AuthenticateUser(string userName, string domainName)
{
    // Authenticate the user against Active Directory.
    // Return true if the user is authenticated, false otherwise.
}

private string[] GetRolesForUser(string userName, string domainName)
{
    // Get the roles for the user from Active Directory.
    // Return an array of role names.
}

3. 在Web应用程序中创建一个登录页面。

4. 在登录页面中添加以下代码：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        if (Request.IsAuthenticated)
        {
            // Redirect the user to the default page.
            Response.Redirect("~/Default.aspx");
        }
    }
}

protected void btnLogin_Click(object sender, EventArgs e)
{
    // Authenticate the user against Active Directory.
    if (AuthenticateUser(txtUserName.Text, txtPassword.Text))
    {
        // Redirect the user to the default page.
        FormsAuthentication.RedirectFromLoginPage(txtUserName.Text, false);
    }
    else
    {
        // Display an error message.
        lblErrorMessage.Text = "Invalid username or password.";
    }
}

private bool AuthenticateUser(string userName, string password)
{
    // Authenticate the user against Active Directory.
    // Return true if the user is authenticated, false otherwise.
}

这些步骤将帮助您实现ASP.NET域自动登录（AD自动登录）。当用户访问您的Web应用程序时，他们将通过Windows身份验证自动登录，并自动通过ASP.NET应用程序进行身份验证。