1. First look at the error list in the project, and then locate the project in Solution Explorer and see if there is a problem with the DLL file reference in the error content in the reference (whether there is a yellow exclamation mark), delete the reference and re-add the DLL file reference; 2 after the operation is complete " Rebuild the solution to see if the problem still exists, if it doesn't work, go ahead ..., close the VS2010 development tool, then reopen it, and then "rebuild the solution", generally to this step of the problem can be solved; 3, if the problem is still not solved, then we need to take the ultimate solution-- Please close your VS2010 development tool, and restart the computer, turn on after the VS2010 "rebuild solution", this problem can be solved in an abridged, my problem to this step to solve.
VS2010 failed to find metadata file (DLL) error resolution
