[英]How to return a custom class from CodeDom in C#?
I want to return a custom class (ex. User
) from a function which created by a Codedom. 我想从Codedom创建的函数中返回自定义类(例如
User
)。 My User
class in another class library in the same solution with my Windows Application
which I use it for Dynamic Code generation. 我的
User
类与Windows Application
在同一解决方案中的另一个类库中,该类用于动态代码生成。
CompilerResult returns these errors: CompilerResult返回以下错误:
The type or namespace name 'TestApp' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'User' could not be found (are you missing a using directive or an assembly reference?)
Here is my code : 这是我的代码:
StringBuilder sbCode = new StringBuilder();
sbCode.Append(@"using System.Windows.Forms;");
sbCode.Append(@"using Nikola.BusinessIntelligence.Objects;");
sbCode.Append(@"using System.Collections.Generic;");
sbCode.Append(@"using System.Text;");
sbCode.Append(@"using Microsoft.CSharp;");
sbCode.Append(@"using TestApp.Data;"); // User class is in this Class Lib
sbCode.Append(" public class Test {");
sbCode.Append(tbCode.Text);
sbCode.Append("}");
var cp = new CompilerParameters()
{
GenerateInMemory = true,
GenerateExecutable = false,
ReferencedAssemblies =
{
"System.dll",
"System.Core.dll",
"System.Windows.dll",
"System.Windows.Forms.dll",
},
};
using (CSharpCodeProvider codeProvider = new CSharpCodeProvider())
{
CompilerResults res = codeProvider.CompileAssemblyFromSource(cp, sbCode.ToString());
var type = res.CompiledAssembly.GetType("Test");
var obj = Activator.CreateInstance(type);
var output = type.GetMethod("Execute").Invoke(obj, new object[] { });
}
And here is my sample code which I write in tbCode text box: 这是我在tbCode文本框中编写的示例代码:
public User Execute()
{
User usr = new User();
return usr;
}
Two problems: 两个问题:
You forgot namespace
: 您忘记了
namespace
:
sbCode.Append(" namespace SomeNameSpace{public class Test {"); sbCode.Append(tbCode.Text); sbCode.Append("}}");
There is missing =
in code you are trying: 您尝试的代码中缺少
=
:
User usr = new User();
In regards of compiler errors, you have to add missing assemblies. 关于编译器错误,您必须添加缺少的程序集。 Try to add all used by current assembly like this:
尝试像这样添加当前程序集使用的所有内容:
var options = new CompilerParameters();
// add all loaded assemblies
options.ReferencedAssemblies.AddRange(
AppDomain.CurrentDomain.GetAssemblies().Where(item => !item.IsDynamic).Select(item => item.Location).ToArray());
options.GenerateExecutable = false;
options.GenerateInMemory = true;
// compile like this
var result = provider.CompileAssemblyFromSource(options, source);
if (result.Errors.HasErrors)
{
// deal with errors
}
Obviously if you type a using something;
显然,如果您
using something;
输入a using something;
in your code, you must add the something
related referenced assembly in the list of referenced assemblies used in CompilerParameters
: 在你的代码,你必须添加
something
在使用引用的程序列表中的相关引用的程序集CompilerParameters
:
var cp = new CompilerParameters()
{
GenerateInMemory = true,
GenerateExecutable = false,
ReferencedAssemblies =
{
"System.dll",
"System.Core.dll",
"System.Windows.dll",
"System.Windows.Forms.dll",
// I assume the following name of the assembly
// however you should update it to the relevant name if needed
"TestApp.Data.dll"
},
};
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