代碼主要是從別的地方扒過來的，自己做過實驗，可行
using System;
using System.Data;
using System.Configuration;
using System.Text;
using System.CodeDom.Compiler;
using Microsoft.CSharp;
using System.Reflection;
namespace EvalGuy
{
/// <summary>
/// 本類用來將字符串轉爲可執行文本並執行
/// </summary>
public class Evaluator
{
#region 構造函數
/// <summary>
/// 可執行串的構造函數
/// </summary>
/// <param name="items">
/// 可執行字符串數組
/// </param>
public Evaluator(EvaluatorItem[] items)
{
ConstructEvaluator(items); //調用解析字符串構造函數進行解析
}
/// <summary>
/// 可執行串的構造函數
/// </summary>
/// <param name="returnType">返回值類型</param>
/// <param name="expression">執行表達式</param>
/// <param name="name">執行字符串名稱</param>
public Evaluator(Type returnType, string expression, string name)
{
//創建可執行字符串數組
EvaluatorItem[] items = { new EvaluatorItem(returnType, expression, name) };
ConstructEvaluator(items); //調用解析字符串構造函數進行解析
}
/// <summary>
/// 可執行串的構造函數
/// </summary>
/// <param name="item">可執行字符串項</param>
public Evaluator(EvaluatorItem item)
{
EvaluatorItem[] items = { item };//將可執行字符串項轉爲可執行字符串項數組
ConstructEvaluator(items); //調用解析字符串構造函數進行解析
}
/// <summary>
/// 解析字符串構造函數
/// </summary>
/// <param name="items">待解析字符串數組</param>
private void ConstructEvaluator(EvaluatorItem[] items)
{
//創建C#編譯器實例
ICodeCompiler comp = (new CSharpCodeProvider().CreateCompiler());
//編譯器的傳入參數
CompilerParameters cp = new CompilerParameters();
cp.ReferencedAssemblies.Add("system.dll"); //添加程序集 system.dll 的引用
cp.ReferencedAssemblies.Add("system.data.dll"); //添加程序集 system.data.dll 的引用
cp.ReferencedAssemblies.Add("system.xml.dll"); //添加程序集 system.xml.dll 的引用
cp.GenerateExecutable = false; //不生成可執行文件
cp.GenerateInMemory = true; //在內存中運行
StringBuilder code = new StringBuilder(); //創建代碼串
/*
* 添加常見且必須的引用字符串
*/
code.Append("using System; \n");
code.Append("using System.Data; \n");
code.Append("using System.Data.SqlClient; \n");
code.Append("using System.Data.OleDb; \n");
code.Append("using System.Xml; \n");
code.Append("namespace EvalGuy { \n"); //生成代碼的命名空間爲EvalGuy，和本代碼一樣
code.Append(" public class _Evaluator { \n"); //產生 _Evaluator 類，所有可執行代碼均在此類中運行
foreach (EvaluatorItem item in items) //遍歷每一個可執行字符串項
{
code.AppendFormat(" public {0} {1}(object c_object) ", //添加定義公共函數代碼
item.ReturnType.Name, //函數返回值爲可執行字符串項中定義的返回值類型
item.Name); //函數名稱爲可執行字符串項中定義的執行字符串名稱
code.Append("{ "); //添加函數開始括號
//code.AppendFormat("return ({0});", item.Expression);//添加函數體，返回可執行字符串項中定義的表達式的值
code.AppendFormat(item.Expression);//添加函數體，返回可執行字符串項中定義的表達式的值
code.Append("}\n"); //添加函數結束括號
}
code.Append(" }}"); // code.Append("} }") //添加類結束和命名空間結束括號
//得到編譯器實例的返回結果
CompilerResults cr = comp.CompileAssemblyFromSource(cp, code.ToString());
if (cr.Errors.HasErrors) //如果有錯誤
{
StringBuilder error = new StringBuilder(); //創建錯誤信息字符串
error.Append("編譯有錯誤的表達式: "); //添加錯誤文本
foreach (CompilerError err in cr.Errors) //遍歷每一個出現的編譯錯誤
{
error.AppendFormat("{0}\n", err.ErrorText); //添加進錯誤文本，每個錯誤後換行
}
throw new Exception("編譯錯誤: " + error.ToString());//拋出異常
}
Assembly a = cr.CompiledAssembly; //獲取編譯器實例的程序集
_Compiled = a.CreateInstance("EvalGuy._Evaluator"); //通過程序集查找並聲明 EvalGuy._Evaluator 的實例
}
#endregion
#region 公有成員
/// <summary>
/// 執行字符串並返回整型值
/// </summary>
/// <param name="name">執行字符串名稱</param>
/// <returns>執行結果</returns>
public int EvaluateInt(string name, object c_object)
{
return (int)Evaluate(name, c_object);
}
/// <summary>
/// 執行字符串並返回字符串型值
/// </summary>
/// <param name="name">執行字符串名稱</param>
/// <returns>執行結果</returns>
public string EvaluateString(string name, object c_object)
{
return (string)Evaluate(name, c_object);
}
/// <summary>
/// 執行字符串並返回布爾型值
/// </summary>
/// <param name="name">執行字符串名稱</param>
/// <returns>執行結果</returns>
public bool EvaluateBool(string name, object c_object)
{
return (bool)Evaluate(name, c_object);
}
/// <summary>
/// 執行字符串並返 object 型值
/// </summary>
/// <param name="name">執行字符串名稱</param>
/// <returns>執行結果</returns>
public object Evaluate(string name, object c_object)
{
MethodInfo mi = _Compiled.GetType().GetMethod(name);//獲取 _Compiled 所屬類型中名稱爲 name 的方法的引用
object[] _object = { c_object };
return mi.Invoke(_Compiled, _object); //執行 mi 所引用的方法
}
#endregion
#region 私有成員
/// <summary>
/// 靜態方法的執行字符串名稱
/// </summary>
private const string staticMethodName = "__foo";
/// <summary>
/// 用於動態引用生成的類，執行其內部包含的可執行字符串
/// </summary>
object _Compiled = null;
#endregion
}
/// <summary>
/// 可執行字符串項（即一條可執行字符串）
/// </summary>
public class EvaluatorItem
{
/// <summary>
/// 返回值類型
/// </summary>
public Type ReturnType;
/// <summary>
/// 執行表達式
/// </summary>
public string Expression;
/// <summary>
/// 執行字符串名稱
/// </summary>
public string Name;
/// <summary>
/// 可執行字符串項構造函數
/// </summary>
/// <param name="returnType">返回值類型</param>
/// <param name="expression">執行表達式</param>
/// <param name="name">執行字符串名稱</param>
public EvaluatorItem(Type returnType, string expression, string name)
{
this.ReturnType = returnType;
this.Expression = expression;
this.Name = name;
}
}
}
使用例子：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data;
//using System.Math have collected to System namespace
namespace calculator_final
{
/// <summary>
/// MainWindow.xaml 的交互邏輯
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
double a = 50 % 4;//mod
double b = System.Math.Sqrt(8);//sqrt
double c = System.Math.Sin(3);//power
string teststring = "1+2+(3+3)*5mod5+2*mod(3,2)";
object result = new DataTable().Compute(a.ToString()+"+2*(-3+4.0)"+"+"+b.ToString()+"*"+c.ToString(), null);
input_box.Text=result.ToString();
}
/*
private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
{
}*/
private void button_sin_Click(object sender, RoutedEventArgs e)
{
input_box.Text = "sin";
float[] a=new float[5]{1,2,3,4,5};
float sum = statistic_or_other.sum(a, 5);
System.Math.Sin(sum);
}
private void button_avg_Click(object sender, RoutedEventArgs e)
{
float[] a = new float[5] { 1, 2, 3, 4, 5 };
float sum = statistic_or_other.sum(a, 5);
input_box.Text = sum.ToString();
}
}
public partial class statistic_or_other
{
public statistic_or_other()
{
}
static public float sum(float[] a, int len)
{
float sum = 0;
for (int i = 0; i < len; i++)
sum += a[i];
return sum;
}
static public float avg(float[] a, int len)
{
float avg = 0;
for (int i = 0; i < len; i++)
avg += a[i];
avg /= len;
return avg;
}
static public float var(float[] a, int len)
{
float var = 0, sum = 0;
for (int i = 0; i < len; i++)
sum += a[i];
sum/=len;
for (int i = 0; i < len; i++)
var += (a[i] - sum) * (a[i] - sum);
var /= len;
return var;
}
static public float varp(float[] a, int len)
{
return len / (len - 1) * var(a, len);
}
static public float stdev(float[] a, int len)
{
return (float)System.Math.Sqrt(var(a, len));
}
static public float stdevp(float[] a, int len)
{
return (float)System.Math.Sqrt(varp(a, len));
}
static public int fact(int n)
{
if (n < 0)
MessageBox.Show("error", "out of the effective boundary ,please input a interger eauqal to or greater than 0");
if (n == 0 || n == 1)
return 1;
else
return n * fact(n - 1);
}
static public float sparse_mod(string s)
{
string teststr = "1+2+(3+3)*5mod5+2*mod(3,2)";
int index=0;
l=teststr.Length;
int[]a= new int[5];
bool search=true;
int i =0;
while (search && (i >=5))
{
index = teststr.IndexOf("mod", index);
if (index == -1)
search = false;
else
a[i++] = index;
index++;
}
for (int j = 0; j < i - 1; j++)
{
try
{
substr = teststr.Substring(a[j] - 1, 1);
}
catch
{}
}
}
}
}
代碼有點亂，修改與調試時打亂了