C#带图标的组合框

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1、·Downloadsourceanddemoproject-14.4KbIntroductionWhenIstartedprogrammingin.NET,IwonderedwheretheImageCombocontrolhadgone(IusedtoprograminVB6).The.NETFrameworkdidn'tseemtohavethisfunctionalitybuilt-in,butit'sveryeasytoaddit.UsingthecodeThecodeconsistsoftwoclasses:Imag

2、eComboandImageComboItem.IfyouwanttousetheminC#,justcopythemintoyourproject;forother.NETlanguages,youcanaddareferencetothelibrary.ThecontrolinheritsfromComboBoxandintroducesonenewmember:theImageListproperty,whichdoesn'trequireanyfurtherexplanation.Thecontrolisownerdr

3、awnandthereisacustomdrawingmethoddefined,sodon'tchangeitsDrawModepropertyifyouwanttoseetheimages.TheImageComboItemclassinheritsfromObject.YoucansetacustomForeColorandithasaMarkpropertywhichdeterminesiftheitemisshowninboldfontstyle(doesnotworkifownerfontisalreadybold

4、).ToaddanitemtoanImageCombowithtext"Icon0"andimageindex0,usethefollowingcode:imageCombo.Items.Add(newImageComboItem("Icon0",0));Codelisting:ImageComboclassusingSystem;usingSystem.Drawing;namespaceSystem.Windows.Forms{publicclassImageCombo:ComboBox{privateImageListim

5、gs=newImageList();//constructorpublicImageCombo(){//setdrawmodetoownerdrawthis.DrawMode=DrawMode.OwnerDrawFixed;}//ImageListpropertypublicImageListImageList{get{returnimgs;}set{imgs=value;}}//customizeddrawingprocessprotectedoverridevoidOnDrawItem(DrawItemEventArgse

6、){//drawbackground&focusrecte.DrawBackground();e.DrawFocusRectangle();//checkifitisanitemfromtheItemscollectionif(e.Index<0)//notanitem,drawthetext(indented)e.Graphics.DrawString(this.Text,e.Font,newSolidBrush(e.ForeColor),e.Bounds.Left+imgs.ImageSize.Width,e.Bounds

7、.Top);else{//checkifitemisanImageComboItemif(this.Items[e.Index].GetType()==typeof(ImageComboItem)){//getitemtodrawImageComboItemitem=(ImageComboItem)this.Items[e.Index];//getforecolor&fontColorforecolor=(item.ForeColor!=Color.FromKnownColor(KnownColor.Transparent))

8、?item.ForeColor:e.ForeColor;Fontfont=item.Mark?newFont(e.Font,FontStyle.Bold):e.Font;//-1:noimageif(item.ImageIndex!=-1){//drawimage,thend