Create a compiler using ASP.Net

Bhuvan Pandey
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I am going to explain to create your own C# compiler using ASP.Net.

What is a compiler

A compiler is a program which used to processes statements (programming statement) written in specific programming language and convert this program into machine language.

Step 1 Add namespaces which used to provide classes and api to work with compilation and execution process

using System.CodeDom.Compiler;
using System.Collections.Specialized;
using System.Diagnostics;

Step 2 Create a user interface which provide interface to users to writing code, checking errors, and buttons to compilations and executions.

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.style2
{
width: 178px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<center>
<div>
<table>
<tr>
<td>
<h3>Code Area</h3>
<asp:TextBox ID="txtCode" runat="server" Height="347px" TextMode="MultiLine"
Width="780px" BorderStyle="Solid" BorderWidth="1px">
using System;
class Test
{
public static void Main()
{
Console.WriteLine("Hello World");
}
}</asp:TextBox>
</td>
<td align="center" class="style2" valign="bottom">
<asp:Button ID="btnCompiler" runat="server" Height="35px" Text="Compile"
Width="150px" onclick="btnCompiler_Click" />
<br />
<br />
<asp:Button ID="btnExecute" runat="server" Height="35px" Text="Execute"
Width="150px" onclick="btnExecute_Click" />
<br />
<br />
<asp:Button ID="btnReset" runat="server" Height="35px" Text="Reset"
Width="150px" onclick="btnReset_Click" />
<br />
<br />
<asp:Button ID="btnClose" runat="server" Height="35px" Text="Close"
Width="150px" onclick="btnClose_Click" />
</td>
</tr>
<tr>
<td colspan="2"><h3>Result Area</h3>
<p>
<asp:ListBox ID="lstCompilerOutput" runat="server" Height="184px" Width="959px">
</asp:ListBox>
</p>
</td>
</tr>
</table>
</div>
</center>
</form>
</body>
</html>

Step 3 Switch your program to code file and create a method which used to define compilation language, return exception message if any and after successful compilation generate assembly as .exe.

public CompilerResults CompileCode(string strCode)
{
CodeDomProvider codeDomProvider = CodeDomProvider.CreateProvider("CSharp");
CompilerParameters parameters = new CompilerParameters();
parameters.GenerateExecutable = true;
string path = Server.MapPath("Output/testFile.exe");
parameters.OutputAssembly = path;
parameters.GenerateInMemory = true;
return codeDomProvider.CompileAssemblyFromSource(parameters, strCode);
}

Note: Output is name of folder which used to store assembly. testFile.exe is name of assembly.

Step 4 Generate click event of btnCompiler button to call CompileCode method and display error message on user interface."

lstCompilerOutput.Items.Clear();
CompilerResults cResult = CompileCode(txtCode.Text);
foreach (var item in cResult.Errors)
{
lstCompilerOutput.Items.Add(item.ToString());
}
if (cResult.Errors.Count == 0)
{
lstCompilerOutput.Items.Add("No Error");
}

Step 5 No Error. mean your code is compile successfully without any error. For testing open your Output folder and check testFile.exe file is there.

Step 6 To Execute. Generate click event of btnExecute button to execute your created assembly as testFile.exe.