要实现“不需要输入登录名和密码即可访问SSRS报告”的解决方法，可以使用以下代码示例：

1. 使用Windows集成身份验证：

using System;
using System.Net;

public class SSRSReportViewer
{
    public void ViewReport(string reportUrl)
    {
        WebClient client = new WebClient();
        client.Credentials = CredentialCache.DefaultCredentials;
        
        byte[] reportData = client.DownloadData(reportUrl);
        
        // 处理报告数据
        
        // 关闭连接
        client.Dispose();
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        SSRSReportViewer reportViewer = new SSRSReportViewer();
        reportViewer.ViewReport("http://your-ssrs-server/ReportServer?/ReportPath&rs:Format=PDF");
    }
}

2. 使用用户名和密码进行身份验证：

using System;
using System.Net;

public class SSRSReportViewer
{
    public void ViewReport(string reportUrl, string username, string password)
    {
        WebClient client = new WebClient();
        client.Credentials = new NetworkCredential(username, password);
        
        byte[] reportData = client.DownloadData(reportUrl);
        
        // 处理报告数据
        
        // 关闭连接
        client.Dispose();
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        SSRSReportViewer reportViewer = new SSRSReportViewer();
        reportViewer.ViewReport("http://your-ssrs-server/ReportServer?/ReportPath&rs:Format=PDF", "your-username", "your-password");
    }
}

请注意，上述示例中的reportUrl参数应该是一个有效的SSRS报告URL，username和password参数是用于身份验证的凭据。