In the field of chemical structure conversion and drawing, OpenBabel is really the broadest. Unfortunately for you, I only used it from command line, never through API.
BUT, there is a C# API for OpenBabel documented here. And it seams that it can output SVG which is an open drawing standard.
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首先，我根本不是.net专家，
在化学结构转换和绘图领域，OpenBabel是确实是最广泛的。不幸的是，我只从命令行使用它，从未通过 API 使用它。
但是，此处记录了 OpenBabel 的 C# API。它可以输出SVG，这是一个开放的绘图标准。
First of all, I'm not at all a .net expert
In the field of chemical structure conversion and drawing, OpenBabel is really the broadest. Unfortunately for you, I only used it from command line, never through API.
BUT, there is a C# API for OpenBabel documented here. And it seams that it can output SVG which is an open drawing standard.
我们为此编写了一个 C# 工具：
http://chem4word.codeplex.com/
它已经开发了好几年，并且可以在.NET 和MS-WORD 中运行。
We have written a C# tool for this:
http://chem4word.codeplex.com/
It has been developed over several years and works inside .NET and MS-WORD.