JIT编译器如何决定何时初始化静态构造函数

最近,我在使用.NET3.5开发的一个应用程序中观察到了以下有趣的场景。在这个特殊的UALR应用程序中,我有一个作为静态变量访问的Singleion对象。我举例说明了.NET运行时应该在我第一次访问它时初始化这个单例对象,但似乎不是这样。NET运行时在访问此particualr对象之前对其进行初始化。下面是一些培多代码,

if(!initSingleton)
   //Do some work without using the singletion class.
else
   //Do some work using the singletion class.

即使在运行时,我的代码也只执行if语句中的代码。NET运行时仍然初始化singleton对象。在一些应用程序运行中,我根本不需要访问这个pariticualr对象!

更新:

private void InitServiceClient(NetworkCredential credentials, bool https)
        {
            string uri = currentCrawlingWebUrl;
            if (!uri.EndsWith("/"))
                uri = string.Concat(uri, "/");
            uri = string.Concat(uri, siteDataEndPointSuffix);

            siteDataService = new SiteData.SiteDataSoapClient();
            siteDataService.Endpoint.Address = new EndpointAddress(uri);

            if (credentials != null)
            {
                siteDataService.ClientCredentials.Windows.ClientCredential = credentials;
            }
            else if (MOSSStateHandler.Instance.UserName.Length > 0 && MOSSStateHandler.Instance.Password.Length > 0)
            {
                siteDataService.ClientCredentials.Windows.ClientCredential.UserName = MOSSStateHandler.Instance.UserName;
                siteDataService.ClientCredentials.Windows.ClientCredential.Password = MOSSStateHandler.Instance.Password;
                siteDataService.ClientCredentials.Windows.ClientCredential.Domain = MOSSStateHandler.Instance.Domain;
            }

            BasicHttpBinding httpBinding = (BasicHttpBinding)siteDataService.Endpoint.Binding;
            httpBinding.Security.Mode = (https ? BasicHttpSecurityMode.Transport : BasicHttpSecurityMode.TransportCredentialOnly);

            string authmode = MOSSConnectorConfiguration.Instance.Config.GetString(ConfigConstants.SHAREPOINT_AUTH_PROVIDER, "ntlm");
            if (authmode.Equals("ntlm", StringComparison.OrdinalIgnoreCase))
                httpBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Ntlm;
            else if (authmode.Equals("kerberos", StringComparison.OrdinalIgnoreCase))
                httpBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Windows;
            else
                throw new Exception(string.Format("Not supported"));
        }

即使我的应用程序不执行else中的代码,如果阻止初始化类MOSSStateHandler。