C# 动态计算表达式的值--动态编译和DataTable.Compute()

public static void TestComput(string expression)
{
//要编译的代码段
string code = @"public class TestCompute
{public static object Compute()
{return @exp;}}";
code = code.Replace("@exp", expression);

CSharpCodeProvider csharpCodeProvider = new CSharpCodeProvider();
CompilerParameters compilerParameters = new CompilerParameters();
//compilerParameters.CompilerOptions = "/t:library";
//compilerParameters.GenerateInMemory = true;
//开始编译
CompilerResults compilerResults = csharpCodeProvider.CompileAssemblyFromSource(compilerParameters, code);
if (compilerResults.Errors.Count > 0)
throw new Exception("编译出错！");
Assembly assembly = compilerResults.CompiledAssembly;
Type type = assembly.GetType("TestCompute");

//使用动态编译计算表达式
object obj = type.GetMethod("Compute").Invoke(null, null);

//使用DataTable的Compute也可以计算一些简单的表达式
DataTable dt = new DataTable();
obj = dt.Compute(expression, null);
}