CheckListBox control usage summary

Hello everyone , I meet you again , I'm your friend, Quan Jun . It is generally believed ：foreach (object obj in checkedListBox1.SelectedItems) You can traverse the selected value . In fact, the traversal here is only the highlighted value, not the checked value . To traverse the checked value, use the following code ：

for ( int i = 0; i < checkedListBox1.Items.Count; i++) { if (checkedListBox1.GetItemChecked(i)) { MessageBox.Show(checkedListBox1.GetItemText(checkedListBox1.Items[i])); } }

//

textBox1.Clear(); for (int i = 0; i < checkedListBox1.Items.Count; i++) { if (checkedListBox1.GetItemChecked(i)) { textBox1.Text+= checkedListBox1.GetItemText(checkedListBox1.Items[i]); } }

//

Reference resources ：

Recently used checklistbox Control , In the process of using it , Spent more time , Here I collected the relevant code snippets , I hope that's helpful . 1. Add item checkedListBox1.Items.Add( “ Blue “); checkedListBox1.Items.Add( “ Red “); checkedListBox1.Items.Add( “ yellow “); 2. Judgment No. i Whether the item is selected , Selected as true, Otherwise false if（checkedListBox1.GetItemChecked(i)） { return true; } else { return false; } 3. Set the first i Whether the item is selected checkedListBox1.SetItemChecked(i, true); // true Change it to false Is not selected . 4. Set select all Add a name select_all Of checkbox Control , Controlled by it checkedListBox Whether to choose all or not . private void select_all_CheckedChanged( object sender, EventArgs e) { if(select_all.Checked) { for ( int j = 0; j < checkedListBox1.Items.Count; j++) checkedListBox1.SetItemChecked(j, true); } else { for ( int j = 0; j < checkedListBox1.Items.Count; j++) checkedListBox1.SetItemChecked(j, false); } } 5. Get all the selected values , And combine the text of the selected item into a string . string strCollected = string.Empty; for ( int i = 0; i < checkedListBox1.Items.Count; i++) { if (checkedListBox1.GetItemChecked(i)) { if (strCollected == string.Empty) { strCollected = checkedListBox1.GetItemText( checkedListBox1.Items[i]); } else { strCollected = strCollected + “ / “ + checkedListBox1. GetItemText(checkedListBox1.Items[i]); } } } 6. Set up CheckedListBox pass the civil examinations i Term Checked state checkedListBox1.SetItemCheckState(i, CheckState.Checked); 7. private void checkBoxAll_CheckedChanged( object sender, EventArgs e) { if (checkBoxAll.Checked) { // If you are selected, you will CheckedListBox All entries in become Checked state for ( int i = 0; i < checkedListBoxLayerControl.Items.Count; i++) { checkedListBoxLayerControl.SetItemCheckState(i, CheckState.Checked); } } else { // Otherwise it will become Unchecked state for ( int i = 0; i < checkedListBoxLayerControl.Items.Count; i++) { checkedListBoxLayerControl.SetItemCheckState(i, CheckState.Unchecked); } } } 8. checkedListBox Radio settings ( Code implementation ) private void chkl_ItemAuditing_ItemCheck( object sender, ItemCheckEventArgs e) { if (chkl_ItemAuditing.CheckedItems.Count > 0) { for ( int i = 0; i < chkl_ItemAuditing.Items.Count; i++) { if (i != e.Index) { this.chkl_ItemAuditing.SetItemCheckState(i, System.Windows.Forms.CheckState.Unchecked); } } } } 9. checkedListBox1 Display all records corresponding to keywords in a database for ( int i = 0; i < table.Rows.Count; i++) { string name = table.Rows[ “ myname “].ToString(); string paw = table.Rows[ “ mypaw “].ToString(); checkedListBox1.Items.Add(name + paw); } 10. for(i= 0;i<CheckedListBox.Items.Count;i++) { if(CheckedListBox.GetItemText( CheckedListBox.Items)== “ The value you get “) { CheckedListBox.SetItemChecked(i, true); } } 11. eliminate checkedListBox1 All options in for ( int i = 0; i < checkedListBox1.Items.Count; i++) { checkedListBox1.Items.Clear(); } 12. // Set the index to index The item of is selected for ( int i = 0; i < checkedListBox1.Items.Count; i++) { checkedListBox1.SetItemChecked(i, true); } 13. for ( int i = 0; i < checkedListBox1.Items.Count; i++) { if (checkedListBox1.GetSelected(i)) { MessageBox.Show(checkedListBox1.CheckedItems.ToString()); } } 14. // Choose checkedListBox1 All the options for ( int i = 0; i < checkedListBox1.Items.Count; i++) { checkedListBox1.SetItemCheckState(i, CheckState.Checked); } 15. for ( int i = 0; i < checkedListBox1.Items.Count; i++) { // If checkedListBox1 Of the i Item selected , // Is displayed checkedListBox1 Corresponding value if (checkedListBox1.GetItemChecked(i)) { MessageBox.Show(checkedListBox1.Items.ToString()); } } 16. // Reverse selection checkedListBox1 The option to for ( int i = 0; i < checkedListBox1.Items.Count; i++) { if (checkedListBox1.GetItemChecked(i)) { checkedListBox1.SetItemChecked(i, false); } else { checkedListBox1.SetItemChecked(i, true); } } 17. // checkedListBox1 Selected item in ->checkedListBox2 for ( int i = 0; i < checkedListBox1.CheckedItems.Count; i++) { checkedListBox2.Items.Add( this.checkedListBox1.CheckedItems); // remove Is to remove a specific value , No index, Pay attention this.checkedListBox1.Items.Remove( this.checkedListBox1.CheckedItems); }

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// Data binding

checkedListBox1.DataSource = dt;

checkedListBox1.DisplayMember = “item”;

checkedListBox1.ValueMember = “code”;

This attribute is in checklistbox It's not in there , But it can be used directly

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for (int i = 0; i < checkedListBox1.Items.Count; i++)

{

if (checkedListBox1.GetItemChecked(i))

{

checkedListBox1.SelectedIndex = i;

// utilize SelectedValue obtain Value When the value of , Only the value of the current focus item can be obtained . So we should treat the whole CheckedListBox All checkmarks in , Let them do the focus item once to get the value of all checked items .

str+= checkedListBox1.SelectedValue;

}

}

20.

CheckedlistBox Control is more useful. The two properties are CheckOnClick by True： It means to select the current row by clicking , by False ： Point twice before you can select .( The default value is False). There is also an attribute of ThreeDCheckBoxes by True: A checkmark representing three dimensions , by False: Display marks indicating the surface .( The default value is False).

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