private void MakeLegend(IActiveView activeView,IPageLayout pageLayout)

{

//定义图例UID对象

UID uid = new UIDClass();

uid.Value="esriCore.Legend";

//设置图例存放的坐标位置

//定义单位

pageLayout.Page.Units = esriUnits.esriCentimeters;

//得到草图容器对象

IGraphicsContainer container = pageLayout as IGraphicsContainer;

//得到当前地图的框架

IMapFrame frameElement = container.FindFrame(activeView.FocusMap) as IMapFrame;

IElement mapElement = frameElement as IElement;

IEnvelope mapEnv = mapElement.Geometry.Envelope;

IEnvelope envelope = new EnvelopeClass();

//通过当前地图框架得到相对位置

envelope.PutCoords(mapEnv.XMin, mapEnv.YMin, mapEnv.XMin + 6.5, mapEnv.YMin + 0.8);

IMapSurroundFrame frame = frameElement.CreateSurroundFrame(uid, null);

ILegend legend = frame.MapSurround as ILegend;

ILegendFormat format = new LegendFormatClass();

format.TitlePosition = esriRectanglePosition.esriTopSide;

format.LayerNameGap=0.0;

format.TextGap=0.0;

format.TitleGap=0.0;

format.HeadingGap=0.0;

format.HorizontalItemGap=0.0;

format.VerticalItemGap=0.0;

format.ShowTitle=true;

ITextSymbol symbol = new TextSymbolClass();

symbol.Text="图例";

System.Drawing.Font ft = new System.Drawing.Font("宋体", 5);

IFontDisp iFontDispFromFont = (IFontDisp)OLE.GetIFontDispFromFont(ft);

symbol.Font=iFontDispFromFont;

symbol.Size = 11.5;

IRgbColor color = (IRgbColor)ESRI.ArcGIS.ADF.Converter.ToRGBColor(Color.Black);

symbol.Color = color;

//文字水平方向的对齐方式

symbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter;

format.TitleSymbol=symbol;

legend.Format=format;

legend.Title="图例";

legend.FlowRight = true;

legend.ClearItems();

IMap map = activeView.FocusMap;

for (int i = 0; i < map.LayerCount; i++)

{

IFeatureLayer layer = (IFeatureLayer)map.get_Layer(i) as IFeatureLayer;

ILegendItem item = new HorizontalLegendItemClass();

item.Columns=(short)map.LayerCount;

item.NewColumn=true;

ITextSymbol symbolItem = new TextSymbolClass();

symbolItem.Size = 11.5;

ILegendClassFormat legClsFormat = new LegendClassFormatClass();

legClsFormat.LabelSymbol = symbolItem;

legClsFormat.PatchHeight = 40;

legClsFormat.PatchWidth = 50;

item.LegendClassFormat = legClsFormat;

item.Layer=layer;

item.KeepTogether=false;

legend.AddItem(item);

}

frame.MapSurround.Name="myLegend";

IFrameProperties properties = frame as IFrameProperties;

ISymbolBorder border = new SymbolBorderClass();

border.Gap=0.0;

border.CornerRounding=0;

IBorder border2 = border;

properties.Border=border2;

IFrameDecoration decoration = new SymbolBackgroundClass();

IRgbColor color1 = (IRgbColor)ESRI.ArcGIS.ADF.Converter.ToRGBColor(Color.LightSeaGreen);

color1.Transparency = 50;

decoration.Color = color1;

decoration.CornerRounding=0;

decoration.HorizontalSpacing=0.0;

decoration.VerticalSpacing=0.0;

properties.Background=((IBackground)decoration);

IElement element = frame as IElement;

element.Geometry=envelope;

element.Activate(activeView.ScreenDisplay);

container.AddElement(element, 0);

activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

}