未处理的NullReferennceException,求大神助攻

[yy13131534999]

this.Initialization();

            //初始化Listview
            soLayers layers = mainform.axSuperMap1.Layers;
            soLayer layer = layers[mainform.cmbLayerName.Text];
            soDataset objDt = layer.Dataset;
            soDatasetVector objDtv = (soDatasetVector)objDt;
            soRecordset objRd = objDtv.Query("", true, null, "");

            soFieldInfo fieldInfo = null;
“System.NullReferenceException”类型的未经处理的异常在 WindowsFormsApplication13.exe 中发生 其他信息: 未将对象引用设置到对象的实例。
求大神助攻

[john_QQ:2335298917]

跟踪一下，看看是哪个变量是null又被引用了，然后查一下原因

[娃都会打酱油了]

Exception的StackTrace会告诉你这异常发生在哪一行

[exception92]

http://www.cnblogs.com/alexis/archive/2010/11/06/1870519.html 学会调试

[yy13131534999]

好，我去试试

[越一步之距]

soLayers layers = mainform.axSuperMap1.Layers; soLayer layer = layers[mainform.cmbLayerName.Text]; 看看这2个对象是否为NULL