C# 如何在类中访问静态方法_C#

C# 如何在类中访问静态方法

C# 如何在类中访问静态方法,c#,C#,这里我用类文件中的静态方法编写了一些代码，请帮助我如何创建静态类的实例 public class ConnectionString { public static void CreateCommand(string querystring, string connectionString) { using(SqlConnection cn = new SqlConnection(connectionString))

这里我用类文件中的静态方法编写了一些代码，请帮助我如何创建静态类的实例

public class ConnectionString
    {

       public static void CreateCommand(string querystring, string connectionString)
        {
           using(SqlConnection cn = new SqlConnection(connectionString))
           {
               SqlCommand cmd = new SqlCommand(querystring, cn);
               cmd.Connection.Open();
               cmd.ExecuteNonQuery();
           }           
        }

    }

就这样说吧：

string querystring = "Your values here";
string connectionString = "Your values here";
ConnectionString.CreateCommand(querystring, connectionString);

  public interface IDataAccess
    {
        void CreateCommand(string querystring, string connectionString);
    }

 public class DataAccess : IDataAccess
    {       

        public void CreateCommand(string querystring, string connectionString)
        {
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand(querystring, cn))
                {
                    cmd.ExecuteNonQuery();
                }             
            }
        }
    }

public class DataController : Controller
    {
        private readonly IDataAccess dataAccess;
        public DataController()
        {
            this.dataAccess = new DataAccess();
        }

        public ActionResult ShowData()
        {
            string querystring = "you t-sql query";
            string connectionString = "<you sql connection string>";

            this.dataAccess.CreateCommand(querystring, connectionString);

            return this.View();
        }
    }

就这样。

就这样称呼它：

string querystring = "Your values here";
string connectionString = "Your values here";
ConnectionString.CreateCommand(querystring, connectionString);

  public interface IDataAccess
    {
        void CreateCommand(string querystring, string connectionString);
    }

 public class DataAccess : IDataAccess
    {       

        public void CreateCommand(string querystring, string connectionString)
        {
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand(querystring, cn))
                {
                    cmd.ExecuteNonQuery();
                }             
            }
        }
    }

public class DataController : Controller
    {
        private readonly IDataAccess dataAccess;
        public DataController()
        {
            this.dataAccess = new DataAccess();
        }

        public ActionResult ShowData()
        {
            string querystring = "you t-sql query";
            string connectionString = "<you sql connection string>";

            this.dataAccess.CreateCommand(querystring, connectionString);

            return this.View();
        }
    }

就是这样。

您的

ConnectionString

类可以重构以实现如下接口：

string querystring = "Your values here";
string connectionString = "Your values here";
ConnectionString.CreateCommand(querystring, connectionString);

  public interface IDataAccess
    {
        void CreateCommand(string querystring, string connectionString);
    }

 public class DataAccess : IDataAccess
    {       

        public void CreateCommand(string querystring, string connectionString)
        {
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand(querystring, cn))
                {
                    cmd.ExecuteNonQuery();
                }             
            }
        }
    }

public class DataController : Controller
    {
        private readonly IDataAccess dataAccess;
        public DataController()
        {
            this.dataAccess = new DataAccess();
        }

        public ActionResult ShowData()
        {
            string querystring = "you t-sql query";
            string connectionString = "<you sql connection string>";

            this.dataAccess.CreateCommand(querystring, connectionString);

            return this.View();
        }
    }

此接口允许我们将其实现注入到您在注释中提到的控制器中。因此，您的

ConnectionString

类（重命名为更有意义的名称

DataAccess

）应该如下所示：

string querystring = "Your values here";
string connectionString = "Your values here";
ConnectionString.CreateCommand(querystring, connectionString);

  public interface IDataAccess
    {
        void CreateCommand(string querystring, string connectionString);
    }

 public class DataAccess : IDataAccess
    {       

        public void CreateCommand(string querystring, string connectionString)
        {
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand(querystring, cn))
                {
                    cmd.ExecuteNonQuery();
                }             
            }
        }
    }

public class DataController : Controller
    {
        private readonly IDataAccess dataAccess;
        public DataController()
        {
            this.dataAccess = new DataAccess();
        }

        public ActionResult ShowData()
        {
            string querystring = "you t-sql query";
            string connectionString = "<you sql connection string>";

            this.dataAccess.CreateCommand(querystring, connectionString);

            return this.View();
        }
    }

然后在控制器/客户机类中，可以在运行时注入具体的实现

public class DataController : Controller
{
    private readonly IDataAccess dataAccess;
    public DataController(IDataAccess dataAcces)
    {
        this.dataAccess = dataAcces;
    }

    public ActionResult ShowData()
    {
        string querystring = "you t-sql query";
        string connectionString = "<you sql connection string>";

        this.dataAccess.CreateCommand(querystring, connectionString);

        return this.View();
    }
}

公共类数据控制器：控制器
{
专用只读IDataAccess数据访问；
公共数据控制器（IDataAccess数据访问）
{
this.dataAccess=dataAcces；
}
公共行动结果显示数据（）
{
string querystring=“yout-sql查询”；
字符串连接字符串=”；
this.dataAccess.CreateCommand（querystring、connectionString）；
返回这个.View（）；
}
}

如果您正在使用MVC，但不知道如何解决依赖关系，请参阅

或者，您可以像下面这样新建DataAccess类的实例：

string querystring = "Your values here";
string connectionString = "Your values here";
ConnectionString.CreateCommand(querystring, connectionString);

  public interface IDataAccess
    {
        void CreateCommand(string querystring, string connectionString);
    }

 public class DataAccess : IDataAccess
    {       

        public void CreateCommand(string querystring, string connectionString)
        {
            using (SqlConnection cn = new SqlConnection(connectionString))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand(querystring, cn))
                {
                    cmd.ExecuteNonQuery();
                }             
            }
        }
    }

public class DataController : Controller
    {
        private readonly IDataAccess dataAccess;
        public DataController()
        {
            this.dataAccess = new DataAccess();
        }

        public ActionResult ShowData()
        {
            string querystring = "you t-sql query";
            string connectionString = "<you sql connection string>";

            this.dataAccess.CreateCommand(querystring, connectionString);

            return this.View();
        }
    }

公共类数据控制器：控制器
{
专用只读IDataAccess数据访问；
公共数据控制器（）
{
this.dataAccess=新的dataAccess（）；
}
公共行动结果显示数据（）
{
string querystring=“yout-sql查询”；
字符串连接字符串=”；
this.dataAccess.CreateCommand（querystring、connectionString）；
返回这个.View（）；
}
}

我不推荐这种方法，因为它不可能进行单元测试

希望这有帮助

您的

ConnectionString