我无法转换'system.data.datarowview'类型的对象来键入'system.iconvertible'这种类型的错误 [英] i have unable to cast object of type 'system.data.datarowview' to type 'system.iconvertible' this type of error

问题描述

无法将'system.data.datarowview'类型的对象转换为'system.iconvertible'类型

i有这种类型的错误PLZ帮助我任何人

  private   void  BindClassGroupCmb（）
 {
  //  显示现有记录列表。 
 尝试 
 {
 
 ClassGroup = _ExcuteData._ExecuteDataSet（  SELECT class_group_name，class_groupid来自class_group_master）; 
  //   cmbClassGroup.Items.Insert（0，--Select  - ）;  
 cmbClassGroup.DataSource = ClassGroup.Tables [ 0 ]; 
 
 cmbClassGroup.DisplayMember =   class_group_name; 
 cmbClassGroup.ValueMember =   class_groupid; 
} 
  catch （Exception ex）
 {
 MessageBox.Show（ 错误： + ex.Message，  Error，MessageBoxButtons.OK，MessageBoxIcon.Error）; 
} 
} 

解决方案

试试这样

 cmbClassGroup.DisplayMember =   class_group_name ; 
 cmbClassGroup.ValueMember =   class_groupid; 
 cmbClassGroup.DataSource = ClassGroup.Tables [ 0 ]; 

你必须在分配数据源 Valuemember 和 Displaymember $ C> ...

unable to cast object of type 'system.data.datarowview' to type 'system.iconvertible'
i have this type of error plz help me anyone

private void BindClassGroupCmb()
{
    //Show existing record list.
    try
    {

        ClassGroup = _ExcuteData._ExecuteDataSet("SELECT class_group_name, class_groupid from class_group_master ");
       //cmbClassGroup.Items.Insert(0, "--Select--");
        cmbClassGroup.DataSource = ClassGroup.Tables[0];

        cmbClassGroup.DisplayMember = "class_group_name";
        cmbClassGroup.ValueMember = "class_groupid";
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

解决方案

Try like this

cmbClassGroup.DisplayMember = "class_group_name";
        cmbClassGroup.ValueMember = "class_groupid";
        cmbClassGroup.DataSource = ClassGroup.Tables[0];

you have to define the Valuemember and Displaymember before assigning a datasource...

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