Loading Assembly Dynamically while executing string C# code

Question

I am executing C# code dynamically by using "CSharpCodeProvider" then compile the code and invoke the method. I need to include a certain DLL files to the compiler in order to call classes from that DLL. I am using the method:

CompilerParameters cp = new CompilerParameters();
cp.ReferencedAssemblies.Add(the path of the DLL File);

But when invoking the method, I get an error :

Could not load file or assembly or one of its dependencies. The system cannot find the file specified.

But when I just include the DLL from Project>References>Add Reference , the code invoked withed any error. Can anyone tell me how to add the reference dynamically on run-time to avoid that error?

Here is the code :

CSharpCodeProvider Code = new CSharpCodeProvider();
ICodeCompiler icc = Code.CreateCompiler();
CompilerParameters cp = new CompilerParameters();

cp.ReferencedAssemblies.Add("system.dll");
cp.ReferencedAssemblies.Add("system.data.dll");
cp.ReferencedAssemblies.Add("system.windows.forms.dll");
cp.ReferencedAssemblies.Add(@"D:\AnalogClockControl.dll");
cp.CompilerOptions = "/t:library";
cp.GenerateInMemory = true;
StringBuilder sb = new StringBuilder("");
sb.Append("using System;\n");
sb.Append("using System.Data;\n");
sb.Append("using System.Windows.Forms;\n");
sb.Append("namespace CSCodeEvaler{ \n");
sb.Append("public class CSCodeEvaler{ \n");
sb.Append("public void test(){AnalogClockControl.AnalogClock _AnalogClock= new AnalogClockControl.AnalogClock();}\n");
sb.Append("} \n");
sb.Append("}\n");
CompilerResults cr = icc.CompileAssemblyFromSource(cp, sb.ToString());
if (cr.Errors.Count > 0)
{
   return  ; //"ERROR: " + cr.Errors[0].ErrorText
}
System.Reflection.Assembly a = cr.CompiledAssembly;
object o = a.CreateInstance("CSCodeEvaler.CSCodeEvaler");
Type t = o.GetType();
MethodInfo mi = t.GetMethod("test"); 
object j = mi.Invoke(o, new object[] {}); // Here where I get the exception

Maybe you're writing the wrong path. Could you show us your code? — e_ne
– e_ne, Commented Dec 23, 2012 at 4:18
My guess would be there's a dependency problem. Try checking the "Assembly loader exception" for more info. — McGarnagle
– McGarnagle, Commented Dec 23, 2012 at 4:38
Thanks guys for your response. Eve: the path is correct, otherwise the error won't be gone if I added the DLL manually. I will post the code in a minute .. dbaseman: Can you please tell me from where I can find the Assembly loader exception ? — user1924025
– user1924025, Commented Dec 23, 2012 at 5:00

sa_ddam213 · Accepted Answer · 2012-12-23 06:11:07Z

1

Maybe you need to add a using statament for AnalogClockControl namespace

sb.Append("using AnalogClockControl;\n"); // whatever the namespace is

EDIT: never mind, that should not compile at all if it was required.

answered Dec 23, 2012 at 6:11

sa_ddam213

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user1924025 Over a year ago

Adding this line wont do anything because when I am defining the instance, I am including the full class name AnalogClockControl.AnalogClock _AnalogClock= new AnalogClockControl.AnalogClock(); Anyway, I tried to add this line and I still have the same error.

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