使用c＃查询documentdb

Question

我想使用下面的代码查询DocumentDB，但是获得异常

  

＆＃34;未处理的类型＆＃39; System.TypeInitializationException＆＃39;＆＃34;

的例外

有人能提出一些建议吗？感谢

    private const string EndpointUrl = @"myEndpointUrl";
    private const string PrimaryKey = "myKey";
    private DocumentClient client;

    static void Main(string[] args)
    {
        try
        {
            DocumentClient client = new DocumentClient(new Uri(EndpointUrl), PrimaryKey);
            var query = client.CreateDocumentQuery(
  "dbs/myDB/colls/myColl",
  "SELECT c.TestRun.dateFinish FROM c order by c.TestRun.dateFinish desc").ToList();
            Console.ReadLine();

        }
        catch (Exception)
        {

            throw;
        }

    }