Blazor Server框架支持使用cookie进行身份验证。默认情况下，它使用的是Identity作为AuthenticationScheme。然而，您也可以自定义AuthenticationScheme并使用自定义的cookie名称和选项。以下是使用自定义AuthenticationScheme的示例代码：

1. 在Startup.cs中定义自定义AuthenticationScheme：

services.AddAuthentication(options =>
{
    options.DefaultScheme = "MyCustomAuthScheme";
})
.AddCookie("MyCustomAuthScheme", options =>
{
    options.Cookie.Name = "MyCustomCookieName";
    options.Cookie.HttpOnly = true;
    options.Cookie.SameSite = SameSiteMode.Strict;
    options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
    options.LoginPath = "/Account/Login";
    options.LogoutPath = "/Account/Logout";
});

2. 使用认证的自定义cookie：

@page "/"

@attribute [Authorize(AuthenticationSchemes = "MyCustomAuthScheme")]

Hello, @context.User.Identity.Name!

@code {
    [CascadingParameter]
    private Task authenticationStateTask { get; set; }
 
    private ClaimsPrincipal _user;
 
    protected override async Task OnInitializedAsync()
    {
        var authState = await authenticationStateTask;
        _user = authState.User;
    }
 
    private AuthenticationProperties SetToken(string key, string value)
    {
        return new AuthenticationProperties
        {
            IsPersistent = true,
            ExpiresUtc = DateTimeOffset.UtcNow.AddDays(7),
            Items =
            {
                { key, value }
            }
        };
    }
 
    private async Task LoginUser()
    {
        var claims = new List
        {
            new Claim(ClaimTypes.Name, "testuser"),
            new Claim(ClaimTypes.Role, "admin")
        };
 
        var identity = new ClaimsIdentity(claims, "MyCustomAuthScheme");
        var principal = new ClaimsPrincipal(identity);
 
        await HttpContext.SignInAsync("MyCustomAuthScheme", principal, SetToken("testkey", "testvalue"));
 
        _user = principal;
        StateHasChanged();
    }
 
    private async Task LogoutUser()
    {
        await HttpContext.SignOutAsync("MyCustomAuthScheme");