最全面的DBGrid标题排序实现方法：
procedure TSrv_SJSetForm.DBGridEh1TitleClick(Column: TColumnEh); var s,cFieldName:string; i:integer; DataSet:TDataSet; procedure setTitle; var ii:integer; cStr:string; c:TColumnEh; begin for ii:=0 to TDBGridEh(Column.Grid).Columns.Count-1 do begin c:=TDBGridEh(Column.Grid).Columns[ii]; cStr:=c.Title.Caption; if (pos('▲',cStr)=1) or (pos('▼',cStr)=1) then begin Delete(cStr,1,2); c.Title.Caption:=cStr; end; end; end; begin //setTitle; DataSet:=Column.Grid.DataSource.DataSet; if Column.Field.FieldKind=fkLookup then begin cFieldName:=Column.Field.KeyFields; Exit; end else if Column.Field.FieldKind=fkCalculated then begin cFieldName:=Column.Field.KeyFields; Exit; end else cFieldName:=Column.FieldName; setTitle; //=================================AdoDataSet===================== if DataSet is TCustomADODataSet then begin s:=TCustomADODataSet(DataSet).Sort; if s='' then begin s:=cFieldName; Column.Title.Caption:='▲'+Column.Title.Caption; end else begin if Pos(cFieldName,s)<>0 then begin i:=Pos('DESC',s); if i<=0 then begin s:=s+' DESC'; Column.Title.Caption:='▼'+Column.Title.Caption; end else begin Column.Title.Caption:='▲'+Column.Title.Caption; Delete(s,i,4); end; end else begin s:=cFieldName; Column.Title.Caption:='▲'+Column.Title.Caption; end; end; TCustomADODataSet(DataSet).Sort:=s; end //============================Clientdataset========================== else if DataSet is TClientDataSet then begin if TClientDataSet(DataSet).indexfieldnames<>'' then begin i:=TClientDataSet(DataSet).IndexDefs.IndexOf('i'+Column.FieldName); if i=-1 then begin with TClientDataSet(DataSet).IndexDefs.AddIndexDef do begin Name:='i'+cFieldName;//Column.FieldName; Fields:=cFieldName;//Column.FieldName; DescFields:=cFieldName;//Column.FieldName; end; end; TClientDataSet(DataSet).IndexFieldNames:=''; TClientDataSet(DataSet).IndexName:='i'+cFieldName;//Column.FieldName; Column.Title.Caption:='▼'+Column.Title.Caption; end else begin TClientDataSet(DataSet).IndexName:=''; TClientDataSet(DataSet).IndexFieldNames:=cFieldName;//Column.Fieldname; Column.Title.Caption:='▲'+Column.Title.Caption; end; end; end;
