What reason is this wrong? Do the report?

CodePudding user response:

Debug it and see which object instantiated, create success or not,

CodePudding user response:

Debugging is the last step error, also don't know is what reason, I refer to the blog to write to this fault

CodePudding user response:

CodePudding user response:

Add a dataset data source, wr. Report. The RegisterData (ds, "");

CodePudding user response:

I this is pass parameters to the report, and then obtain corresponding data according to the parameter to print statements

CodePudding user response:

Did you add the breakpoint,
That when you are debugging, see if the report null ah,,,,

CodePudding user response:

Debugging and see where the NULL values, add a judgment, feeling is the path to the file didn't you write to?

CodePudding user response:

I debug report is not null, relative and absolute paths are used, and have a big web demo