C# 動態執行JS

有時候需要，在程序中靈活的嵌入自定義的計算邏輯，使用C#加載JS腳本形式可以實現；

// 添加引用 using Microsoft.JScript;
string jsStr = "var i=100; i++; i=i*100; var obj = {a:i};";

Stopwatch sw = new Stopwatch();
sw.Start();
object ret1 = null;
try
{
    ret1 = Eval.JScriptEvaluate(jsStr, VsaEngine.CreateEngine());
}
catch (Exception ex)
{
    MessageBox.Show(ex.StackTrace.ToString(), "執行失敗", MessageBoxButtons.OK, MessageBoxIcon.Error);
    return;
}

sw.Stop();

string res = "";
if (ret1 is ArrayObject)
{
    // 數組
    ArrayObject arr = (ArrayObject)ret1;
                
    res = arr[0].ToString();
}
else if (ret1 is JSObject)
{
    // 對象
    JSObject obj = (JSObject)ret1;

    res = obj["a"].ToString();
}
else
{
    // 單值
    res = ret1.ToString();
}

MessageBox.Show(res + " 用時：" + sw.ElapsedMilliseconds.ToString() + "ms");