如何访问DropDownList的静态方法 [英] How to access dropdownlist in static method

问题描述

我有以下的静态方法。

public static List<string> GetAutoCompleteData(string StudentId)
    {
            List<string> result = new List<string>();
            using (SqlConnection con = new SqlConnection("Data Source=.;Integrated Security=true;Initial Catalog=SMS"))
            {
                //using (SqlCommand cmd = new SqlCommand("select  StudentId,StudentName from tblStudent where StudentId LIKE '%'+@SearchText+'%'", con))
                using (SqlCommand cmd = new SqlCommand("select  T1.StudentName,T1.StudentId from tblStudent T1 where StudentId LIKE '%'+@SearchText+'%' except  select T2.StudentName, T2.StudentId from tblStudentAcademics T2 where T2.AcademicYear='" +Dropdownvalue + "'", con))
                {

                    con.Open();
                    cmd.Parameters.AddWithValue("@SearchText", StudentId);
                    SqlDataReader dr = cmd.ExecuteReader();
                    while (dr.Read())
                    {
                        result.Add(dr["StudentId"].ToString() + "-" + dr["StudentName"].ToString());
                    }
                    return result;
                }

        }
    }

我需要的地方Dropdownvalue.Help来写ddlAcadeic.selectedvalue.tostring（）我

I need to write ddlAcadeic.selectedvalue.tostring() in place of Dropdownvalue.Help me

推荐答案

DROPDOWNLIST对象是类的非静态成员（网页）和静态方法不能访问不是静态成员。 DropDownList的值传递给当你调用它的静态方法。

Dropdownlist object is non static member of your class (Web Page) and static methods can not access not static members. Pass the dropdownList value to static method when you call it.

静态成员

Static Members

静态方法和属性不能访问非静态字段和
  事件在其包含的类型，而不能访问实例
  任何对象的变量，除非它在一个方法被明确地传递
  参数。

Static methods and properties cannot access non-static fields and events in their containing type, and they cannot access an instance variable of any object unless it is explicitly passed in a method parameter.

的的静态方法定义的

public static List GetAutoCompleteData(string StudentId, string dropdownvalue ) {
  //Your code
}

的的静态方法调用的

StaticMethodClass.GetAutoCompleteData("studendId", dropdown.SelectedValue);

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