比例符号渲染的最小值符号宽度设置不起作用

比例符号设置的最小值符号的宽度不起作用，没有应用到图层渲染，但颜色起作用了。符号宽度需要在符号设置页面点击确认按钮才起作用。
 
IGeoFeatureLayer pGeoFeatureLayer = pFeatLyr as IGeoFeatureLayer;
ITable pTable = pFeatLyr as ITable;
ICursor pCursor = pTable.Search(null, true);
//利用IDataStatistics和IStatisticsResults获取渲染字段的统计值，最主要是或得最大值和最小值
IDataStatistics pDataStatistics = new DataStatisticsClass();
pDataStatistics.Cursor = pCursor;
pDataStatistics.Field = sFieldName;
IStatisticsResults pStatisticsResult = pDataStatistics.Statistics;
IProportionalSymbolRenderer pProportionalSymbolRenderer;
if (pStatisticsResult != null) {
    IColor pColor = GetRGBColor(255, 90, 0);
    ISymbol pSymbol = GetDefaultSymbol(pFeatLyr.FeatureClass.ShapeType, pColor);
    pProportionalSymbolRenderer = new ProportionalSymbolRendererClass();
    pProportionalSymbolRenderer.ValueUnit = esriUnits.esriUnknownUnits; //设置渲染单位
    pProportionalSymbolRenderer.Field = sFieldName; //设置渲染字段   
    pProportionalSymbolRenderer.FlanneryCompensation = false; 
    ISimpleLineSymbol pLineSymbol = new SimpleLineSymbolClass();
    pLineSymbol.Color = pColor as IColor;
    pLineSymbol.Width = 0.1;//注意：设置的符号宽度不起作用，显示的还是默认的宽度1，需要在符号设置页面再点一下确认按钮
    pLineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;
    ISymbol pSymbol = pLineSymbol as ISymbol;
    pProportionalSymbolRenderer.MinSymbol = pSymbol;
    pProportionalSymbolRenderer.MinDataValue = pStatisticsResult.Minimum; 
    pProportionalSymbolRenderer.MaxDataValue = pStatisticsResult.Maximum;
    pProportionalSymbolRenderer.LegendSymbolCount = 3; 
    pProportionalSymbolRenderer.CreateLegendSymbols();         
    pGeoFeatureLayer.Renderer = (IFeatureRenderer) pProportionalSymbolRenderer;
    //刷新
    (ArcMap.Document.FocusMap as IActiveView).PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
    IDocument document = ArcMap.Application.Document;
    IMxDocument mxDocument = document as IMxDocument;
    IContentsView contentView = mxDocument.CurrentContentsView;
    contentView.Refresh(null);