Question

无法将类型为"System.Double"的对象强制转换为类型"System.String"

//遍历所有的要素
while (pNextRow != null)
{
pNextRowBuffer = pNextRow;
//找出Row为“STATES_NAME”的值，即不同的州名
codeValue = (string)pNextRowBuffer.get_Value(lfieldNumber);
//获取随机颜色带中的任意一个颜色
pNextUniqueColor = pEnumRamp.Next();
if (pNextUniqueColor == null)
{
pEnumRamp.Reset();
pNextUniqueColor = pEnumRamp.Next();
}
pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = pNextUniqueColor;
//将每次都得的要素字段值和修饰它的符号值放入着色对象中
pUniqueValueR.AddValue(codeValue, strNameField, (ISymbol)
pFillSymbol);
pNextRow = pCursor.NextRow();
}
m_pGeoFeatureL.Renderer = (IFeatureRenderer)pUniqueValueR;
axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
}

codeValue = (string)pNextRowBuffer.get_Value(lfieldNumber); 这句有问题
无法将类型为"System.Double"的对象强制转换为类型"System.String"

Answer 1

建议试下
rmoutbackinfo.StockPrice = selectpriceread[0].ToString();
rmoutbackinfo.RetailPrice = selectpriceread[1].ToString();

Answer 2

codeValue = pNextRowBuffer.get_Value(lfieldNumber).ToString();