Teigha.NET is a managed .NET component containing tools for working with DWG data. Built on top of the Teigha C++ development environment, Teigha.NET exposes access to DWG application development using the .NET framework using any .NET language (C#, Visual Basic, C++/CLI).
还不错，是Teigha.NET for .DWG的开发者指南。
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