关于listview

Question

现有一个listview需载入数据库数据，想判断某一字段是否唯空，如为空checkbox值位false

Answer 1

var
   ListItem:TListITem;begin
   ListItem:=ListView.Items.Add;
   ListItem.Caption:=ds.FieldByName('Field1').AsString;
   ListItem.SubItems.Add(ds.FieldByName('Field2').AsString);
   if ds.FieldByName('field3').IsNull then
      ListItem.Checked:=true;

Answer 2

if ADOQuery1.FieldByName('Field1').isnull then
  listview.checked[listview.Items.indexof(ADOQuery1.FieldByName('Field1').asString)]:=false;

Answer 3

反了。应该是：
   if ds.FieldByName('field3').IsNull then
      ListItem.Checked:=false;

Answer 4

我要向listview写多行，就不行了

Answer 5

var
   ListItem:TListITem;
begin
   ds.First;
   for i:=0 to ds.RecordCount-1 do
   begin
       ListItem:=ListView1.Items.Add;
       ListItem.Caption:=ds.FieldByName('Field1').AsString;
       ListItem.SubItems.Add(ds.FieldByName('Field2').AsString);
       if ds.FieldByName('field3').IsNull then
          ListItem.Checked:=false
       else
          ListItem.Checked:=true;
       ds.Next;
    end;

Answer 6

建议：
       if ds.FieldByName('field3').IsNull then
          ListItem.Checked:=false
       else
          ListItem.Checked:=true;
改为：
ListItem.Checked:= Not ds.FieldByName('field3').IsNull;

Answer 7

if ds.FieldByName('field3').IsNull then
          ListItem.Checked:=false
       else
          ListItem.Checked:=true;