supermap自写方法,仅供初学者参考（一） 外部数据关联生成专题图的方法（C#版）

 asp.net版:

 /// <summary>
    /// 创建分段专题图
    /// 使用此方法前应调用ClearThemeLayer清除专题图
    /// </summary>
    /// <param name="ThemeLayer">要创建专题图的图层</param>
    /// <param name="FiledMap">图层中与外部数据关联的字段</param>
    /// <param name="FiledName">关联的外部字段</param>
    /// <param name="Themedt">关联的外部数据表</param>
    /// <param name="ThemeCount">分为几段</param>
    /// <param name="ThemeBreakValue">分段值的范围</param>
    /// <param name="ThemeBreakName">分段的名称,第一项为专题的名称</param>
    /// <param name="ThemeColor">专题图的颜色</param>
    /// <param name="DisplayFilter">是否进行图层过滤</param>
    public void CreateTheme(Layer ThemeLayer, string FiledMap, string[] FiledName, DataTable Themedt, int ThemeCount, double[] ThemeBreakValue, string[] ThemeBreakName, System.Drawing.Color[] ThemeColor, MapControl MapControl1)
    {
        if (ThemeLayer == null)
        {
            return;
        }

        ThemeLayer.Visible = true;
        RangeTheme objThemeR;
        ThemeLayer.ThemeRange = new RangeTheme();
        objThemeR = ThemeLayer.ThemeRange;
        objThemeR.Enabled = true;
        objThemeR.Caption = ThemeBreakName[0];
        objThemeR.Expression = " ";
        ThemeLayer.ThemeRange.ForeignDataParam = new ForeignDataParam();
        objThemeR.ForeignDataParam.UseForeignValue = true;
        objThemeR.ForeignDataParam.ForeignJoinExpression = FiledMap;

        objThemeR.BreakValues = new double[ThemeCount];
        for (int i = 0; i < ThemeCount; i++)
        {
            objThemeR.BreakValues[i] = ThemeBreakValue[i];
        }
        SetThemeStyle(ThemeLayer.Style, objThemeR, ThemeColor);
        if (Themedt.Rows.Count >= 1)
        {
            objThemeR.ForeignDataParam.ForeignKeys = new string[Themedt.Rows.Count];
            objThemeR.ForeignDataParam.ForeignValues = new string[Themedt.Rows.Count];

            for (int i = 0; i < Themedt.Rows.Count; i++)
            {
                objThemeR.ForeignDataParam.ForeignKeys[i] = Themedt.Rows[i][FiledName[0]].ToString().Trim();
                objThemeR.ForeignDataParam.ForeignValues[i] = Themedt.Rows[i][FiledName[1]].ToString().Trim(); ;
            }
        }
        MapControl1.ClearCache();
        MapControl1.Update();
        MapControl1.ClearHighlight();
    }

 

桌面版：

 

 /// <summary>
        /// 创建分段专题图
        /// 使用此方法前应调用ClearThemeLayer清除专题图
        /// </summary>
        /// <param name="ThemeLayer">要创建专题图的图层</param>
        /// <param name="FiledMap">图层中与外部数据关联的字段</param>
        /// <param name="FiledName">关联的外部字段</param>
        /// <param name="Themedt">关联的外部数据表</param>
        /// <param name="ThemeCount">分为几段</param>
        /// <param name="ThemeBreakValue">分段值的范围</param>
        /// <param name="ThemeBreakName">分段的名称,第一项为专题的名称</param>
        /// <param name="ThemeColor">专题图的颜色</param>
        /// <param name="DisplayFilter">是否进行图层过滤</param>
        private void CreateTheme(soLayer ThemeLayer, string FiledMap, string[] FiledName, DataTable Themedt, int ThemeCount, double[] ThemeBreakValue, string[] ThemeBreakName, Color[] ThemeColor, bool DisplayFilter)
        {
            if (ThemeLayer == null)
            {
                return;
            }

            ThemeLayer.Visible = true;

            soThemeRange objThemeR = null;
            seDatasetType nDtType = 0;

            nDtType = ThemeLayer.Dataset.Type;
            objThemeR = ThemeLayer.ThemeRange;
            objThemeR.IsForeignValue = 2;//使用外部关联图

            objThemeR.Field = "SmId";

            objThemeR.BreakCount = ThemeCount;

            for (int i = 0; i < ThemeCount; i++)
            {
                objThemeR.set_BreakValue(i + 1, ThemeBreakValue[i]);
                objThemeR.set_ItemCaption(i + 1, ThemeBreakName[i + 1]);
            }
            objThemeR.set_ItemCaption(ThemeCount + 1, ThemeBreakName[ThemeCount + 1]);
            SetThemeStyle(ThemeLayer.Style, objThemeR, nDtType, ThemeColor);

            objThemeR.Caption = ThemeBreakName[0];

            objThemeR.ForeignJoinExpression = FiledMap;

            string strWhere = " ";

            if (Themedt.Rows.Count > 0)
            {
                for (int i = 0; i < Themedt.Rows.Count; i++)
                {
                    objThemeR.set_ForeignValue(Themedt.Rows[i][FiledName[0]].ToString().Trim(), Themedt.Rows[i][FiledName[1]].ToString());
                    strWhere += "'" + Themedt.Rows[i][FiledName[0]].ToString().Trim() + "',";
                }
            }

            objThemeR.Enable = true;
            ThemeLayer.ThemeUnique.Enable = false;

            if (DisplayFilter)
            {
                strWhere = strWhere.TrimEnd(',');

                if (strWhere != "''")
                {
                    if (chkYes.Visible == true || chkNo.Visible == true)
                    {
                        strWhere = FiledMap + " in ( " + strWhere + ")";
                    }
                    else
                    {
                        strWhere = "";
                    }
                    ThemeLayer.DisplayFilter = strWhere;
                }
            }

            SuperMap1.Refresh();
            Marshal.ReleaseComObject(objThemeR);
            objThemeR = null;
        }