ArcEngine对Blob字段赋值的方法
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);
来自:http://www.cnblogs.com/ITGIS/archive/2013/01/12/2857758.html