prizm1 prizm1 - 3 months ago 27
C# Question

Compiling with CodeDom

I started experimenting a bit with CodeDom and made simple Application which collects sourcecode from the user input and tries to compile it with C#-Syntax.

For those who want to try the whole proccess, type end... to finish up the sourcecode entry.

Here's the example:



using System;
using System.Collections;
using System.Reflection;
using System.Collections.Generic;
using System.Diagnostics;
using Microsoft.CSharp;
using System.CodeDom.Compiler;

namespace CodeDomTest
{
class Program
{
static void Main(string[] args)
{
getTestCode();
}

public static Assembly getTestCode()
{
CompilerParameters CompilerOptions = new CompilerParameters(
assemblyNames: new String[] { "mscorlib.dll", "System.dll", "System.Core.dll" },
outputName: "test.dll",
includeDebugInformation: false)
{ TreatWarningsAsErrors = true, WarningLevel = 0, GenerateExecutable = false, GenerateInMemory = true };
List<String> newList = new List<String>();
String a = null;
while(a != "end...")
{
a = Console.ReadLine();
if (!a.Equals( "end..."))
newList.Add(a);
}
String[] source = { "class Test {static void test() {System.Console.WriteLine(\"test\");}}" };
source = newList.ToArray();
CSharpCodeProvider zb = new CSharpCodeProvider(new Dictionary<String, String> { { "CompilerVersion", "v4.0" } });
CompilerResults Results = zb.CompileAssemblyFromSource(CompilerOptions, source);
Console.WriteLine(Results.Errors.HasErrors);
CompilerErrorCollection errs = Results.Errors;
foreach(CompilerError z in errs)
{
Console.WriteLine(z.ErrorText);
}
if (!(errs.Count > 0))
{
AssemblyName assemblyRef = Results.CompiledAssembly.GetName();
AppDomain.CurrentDomain.Load(assemblyRef);
//foreach (String a in )
Console.WriteLine(Results.CompiledAssembly.FullName.ToString());
Type tempType = Results.CompiledAssembly.GetType("Test");
MethodInfo tempMethodInfo = tempType.GetMethod("test", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
if (tempMethodInfo != null)
tempMethodInfo.Invoke(null,null);
}
Console.ReadLine();
return null;
}
}
}


Now as you can see, basically it compiles the following code:

class Test {static void test() {System.Console.WriteLine(\"test\");}}


Which works fine if you enter it like that (without the ") as userinput into the program. But as soon as you insert a line break by pressing enter after one finished line, the compiling breaks with several errors. It seems like it would evaluate each line as own program by giving following statements:

} expected
Expected class, delegate, enum, interface, or struct
A namespace cannot directly contain members such as fields or methods
A namespace cannot directly contain members such as fields or methods
Type or namespace definition, or end-of-file expected
Type or namespace definition, or end-of-file expected


For following input:

class Test
{
static void test()
{
System.Console.WriteLine
("test");
}
}


Do I have to break user (custom) entries down to one line then?

Answer

Each line in sources should contain complete source code not a single line of code. Since you're gathering the code line by line into your source array, you'll have to collapse it into a single string then add that string to an array to pass to CompileAssemblyFromSource Try this:

 while (a != "end...")
 {
     a = Console.ReadLine();
     if (!a.Equals("end..."))
         newList.Add(a);
 }

 string code = string.Join("\r\n", newList);
 string[] source = new string[] { code };
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