comboBox.SelectedItem 问题

Question

ComboBox is binding database

string str= comboBox1.SelectedItem.ToString();

the line gives System.Data.DataRowView value for str but not giving selected item name.

Answer 1

try this

if (comboBox1.SelectedItem is DataRowView) {
  string sval = ((DataRowView)comboBox1.SelectedItem).Row["ColumnName"].ToString();
}

Answer 2

Use the DisplayMember and ValueMember Properties for the combobox before you assign the DataSource , and use SelectedValue instead of SelectedItem .

For example, if you have a List<MyClass> - where MyClass has a property int ID , and another one string Title - and you want to assign it as the DataSource of comboBox1 , you should write:

List<MyClass> myList; 
...

comboBox1.DisplayMember = "Title";
comboBox1.ValueMember = "ID";
comboBox1.DataSource = myList;

Now comboBox1.SelectedValue is an object{int} , which can be casted to int and used.

Answer 3

If you want the text of the selected item, just use comboBox1.Text .

Answer 4

ToString() is inherited from the Object-Class. The default implementation states the Class Name of the corresponding object.

you may want to cast the SelectedItem to a DataRowView to access the column-values for that row

Ex:

String str = ((DataRowView)comboBox1.SelectedItem)["ColumnNameHere"];