How to write table blob field to file using ArcObjects?

Question

I have a table with blob field and some others as well. I am trying to read blob field and save it to file using IBlobStream, and the thing compiles. The problem comes up in run-time, when calling blobStream.SaveToFile() method, saying:

'object' does not contain a definition for 'SaveToFile'

the following code:

int blobFieldID= table.Fields.FindField("MODEL_NAME");
int nameFieldID= table.Fields.FindField("MODEL");
ICursor cursor = table.Search(null, true);
IRow row = cursor.NextRow();
while (row != null)
{
 IBlobStream blobStream = (IBlobStream)row.get_Value(blobFieldID);
 blobStream.SaveToFile(@"C:\TEMP\" + row.get_Value(nameFieldID) + ".tbx"); //error
 row = cursor.NextRow();
}

When i hover mouse over SaveToFile method it says:

(dynamic expression)
This operation will be resolved at runtime

I can't figure out what's the problem in here

• Darksanta: Hi, is this sample running on such as console application?
• Sunder: @Darksanta No, It is an action on button click - ESRI.ArcGIS.SystemUI.ICommand.OnClick()
• Darksanta: hmm, it looks like strange problem. Usually these kind of error happen when using dynamic keyword. Is this able to get other field values correctly?
• Petr Krebs: Ensure that "Embed interop types" is turned off for all Esri references. Second, try IMemoryBlobStream instead of IBlobStream (this really shouldn't make a difference though).
• Sunder: @Petr Krebs Ohh right... I were making this in new project, and forgot to set Embed interop types to false so they would no longer by dynamic - problem solved, Thanks! You can actually make it as an answer I guess.

Answer 1

Ensure that "Embed interop types" is turned off for all Esri interop assembly references.