Question

当我尝试添加对IronPython引擎实例的引用时，引用get将按预期添加到引用中。如果我创建引擎的另一个实例，则AddReference执行时没有错误，但引用未添加到引用，并且import语句失败，并且“没有名为...的模块”。

var engine = Python.CreateEngine();
dynamic clr = engine.Runtime.GetClrModule();
clr.AddReference("IronPython.StdLib");
var references = (IEnumerable<Assembly>)clr.References;
Debug.Assert(references.Any(asm => asm.FullName.StartsWith("IronPython.StdLib"))); // ok

var source = "import pydoc\npydoc.plain(pydoc.render_doc(str))";
var result = engine.Execute<string>(source);
Debug.Assert(result.StartsWith("Python Library Documentation")); // ok

var engine2 = Python.CreateEngine();
dynamic clr2 = engine2.Runtime.GetClrModule();
clr2.AddReference("IronPython.StdLib");
var references2 = (IEnumerable<Assembly>)clr.References;
Debug.Assert(references2.Any(asm => asm.FullName.StartsWith("IronPython.StdLib"))); // fails

result = engine.Execute<string>(source); // throws ImportException "no module named pydoc"
Debug.Assert(result.StartsWith("Python Library Documentation"));

我尝试使用IronPython 2.7.5的二进制版本（安装到GAC）和C＃4.5，IronPython.StdLib是使用pyc的Python标准库的预编译DLL。

我也尝试过使用github自编译的IronPython 2.7.5和2.7.6，但是第一个engine.execute已经失败了，"no module named pydoc"虽然添加了引用。

我做错了什么或者只是一个错误？

Answer 1

一位同事发现了失败的原因。我在这里发布，以防其他人偶然发现这个问题。

添加引用后需要加载程序集：

var engine = Python.CreateEngine();
dynamic clr = engine.Runtime.GetClrModule();
clr.AddReference("IronPython.StdLib");

// load assembly into engine
var assembly = Assembly.LoadFrom("IronPython.StdLib.dll");
engine.Runtime.LoadAssembly(assembly); 

var references = (IEnumerable<Assembly>)clr.References;
Debug.Assert(references.Any(asm => asm.FullName.StartsWith("IronPython.StdLib"))); // ok

var source = "import pydoc\npydoc.plain(pydoc.render_doc(str))";
var result = engine.Execute<string>(source);
Debug.Assert(result.StartsWith("Python Library Documentation")); // ok

var engine2 = Python.CreateEngine();
dynamic clr2 = engine2.Runtime.GetClrModule();
clr2.AddReference("IronPython.StdLib");

// load assembly into engine2
engine2.Runtime.LoadAssembly(assembly); 

var references2 = (IEnumerable<Assembly>)clr.References;
Debug.Assert(references2.Any(asm => asm.FullName.StartsWith("IronPython.StdLib"))); // does not fail

result = engine.Execute<string>(source); // does not throw any more
Debug.Assert(result.StartsWith("Python Library Documentation"));

为什么clr.AddReference在第二个IronPython引擎上失败？

1 个答案: