Crystal reports error in SetDataSource

问题

I am having trouble in VS 2010 sap crystalreports, using c# to make a windows application.

I get the following error with the following code:

 CrystalReport1 cr1 = new CrystalReport1();
 cr1.SetDataSource(dt1); //Error 

Could not load file or assembly 'file:///C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win64_x64\dotnet1\crdb_adoplus.dll' or one of its dependencies. The system cannot find the file specified.

回答1:

Try using this solution by adding the useLegacyV2RuntimeActivationPolicy attribute to your .config file

<startup useLegacyV2RuntimeActivationPolicy="true">

回答2:

 <startup useLegacyV2RuntimeActivationPolicy="true" >
    <supportedruntime version="v4.0" sku=".NETFramework,Version=v4.0" />
 </startup>

Add this code in app.config.

回答3:

You probably need to install the crystal reports runtime files. You should be able to do a google search to find them. The error message is pretty explicit in telling you the problem is a missing .dll. Read it ;)

edit: Try locating the crdb_adoplus.dll on your machine and copying it to the application directory.

来源：https://stackoverflow.com/questions/10940940/crystal-reports-error-in-setdatasource