[求助]还是关于着色问题！！

  
一个map控件中加载了3个矢量图层，现在希望在窗体初始化时令其中一个多边形图层显示名字，我用的是labelrenderer着色方法；还需要为3个
图层中的一个线形图层用唯一值着色方法着色，valuemaprenderer，可是却怎么也着不上色，而且该图层也看不到了。为什么？？我换了几个线形
图层就不行，多边形就可以。

Dim MLayer As MapObjects2.MapLayer

 Set MLayer = New MapObjects2.MapLayer

 Set MLayer = Map1.Layers("yhxl")

 Set vmr_2 = New MapObjects2.ValueMapRenderer

 Dim recs2_2 As New MapObjects2.Recordset

 Dim str2 As New MapObjects2.Strings

 Dim a As Integer

 Set recs2_2 = MLayer.SearchExpression("FeatureId>-1 order by classes")

 

 Do While Not recs2_2.EOF

   str2.Add recs2_2.Fields("classes").Value

   recs2_2.MoveNext

 Loop

 

 vmr_2.Field = "classes"

 vmr_2.UseDefault = True

 vmr_2.ValueCount = str2.count  '5

 For a = 0 To str2.count - 1

   vmr_2.Value(a) = str2(a)

   If a = 0 Then

     vmr_2.Symbol(a).Size = 5

     vmr_2.Symbol(a).Color = moRed

   ElseIf a = 1 Then

     vmr_2.Symbol(a).Color = RGB(10, 147, 252)

   End If

 Next a

 Set MLayer.Renderer = vmr_2

 Map1.Refresh

代码肯定没错。

就是不能用！！

<P>这个可以用，你自己看看区别吧，拷贝到窗体就可以用，注意图层名字和字段名字</P><P>Option Explicit</P><P>Private Sub Command1_Click()</P><P>Dim vmr As New MapObjects2.ValueMapRenderer
vmr.Field = "PopRange"
vmr.SymbolType = moPointSymbol
<FONT color=#ff3300>vmr.ValueCount = 3
vmr.Value(0) = "Low"
vmr.Value(1) = "Medium"
vmr.Value(2) = "High"</FONT></P><P>Dim fnt As New stdole.StdFont
fnt.Name = "ESRI Cartography"</P><P>Dim i As Integer
For i = 0 To 2
  With vmr.Symbol(i)
    .SymbolType = moPointSymbol
    .Style = moTrueTypeMarker
    .Size = 12
    Set .Font = fnt
    .CharacterIndex = 65 + i
  End With
Next i</P><P>
'vmr.Symbol(0).Style = moCircleMarker
'vmr.Symbol(1).Style = moTriangleMarker
'vmr.Symbol(2).Style = moCrossMarker</P><P>Set Map1.Layers(0).Renderer = vmr</P><P>Map1.Refresh</P><P>End Sub</P><P>Private Sub Form_Load()</P><P>Dim dc As New MapObjects2.DataConnection
Dim mlyr As New MapObjects2.MapLayer
dc.Database = App.Path
dc.Connect
Set mlyr.GeoDataset = dc.FindGeoDataset("<FONT color=#f73809>capitals</FONT>")
mlyr.Symbol.Color = moBlue
Map1.Layers.Add mlyr</P><P>End Sub
</P>

    开始我还以为point和line 的不行呢！！

   已经成功了，谢谢gis