今天在测试数据入库程序,发现对某个图层操作之后,调用StopOperation,会出现“尝试写入或读取受保护的内存”错误。
经过测试,最终发现是因为该图层包含有Blob字段,而代码没有专门对Blob字段进行处理。
解决办法:
1、需要判断字段类型,如果是Blob类型,调用下面辅助方法获取Blob值:IMemoryBlobStreamVariant varBlobStream = objFieldValue as IMemoryBlobStreamVariant;
if (varBlobStream == null) return null; object objValue; varBlobStream.ExportToVariant(out objValue); byte[] bytesArray = objValue as byte[];2、然后调用下面方法赋值:
IMemoryBlobStream pMBS = new MemoryBlobStreamClass();
IMemoryBlobStreamVariant varBlobStream = (IMemoryBlobStreamVariant)pMBS; object objValue = bytesArray; varBlobStream.ImportFromVariant(objValue); pFeature.set_Value(posField, varBlobStream);