界面如下：

然后，click filter button后的UI：

看，筛选出来了，代码如下（js能调C#写的UserInfo类的各个属性）

复制代码 代码如下:

public class UserInfo

    {

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public int Age { get; set; }

        public override string ToString()

        {

            return string.Format(“{0}, {1}: {2}”, FirstName, LastName, Age);

        }

    }

private void btnSearch_Click(object sender, EventArgs e)
        {
            List<UserInfo> users = FilterUsers(txtFilter.Text.Trim());
            lstUsers.DataSource = users;
        }

        private List<UserInfo> FilterUsers(string jsFilter)
        {
            List<UserInfo> results = new List<UserInfo>();
            if (jsFilter.Trim().Length == 0)
                return this.users;

            try
            {
                using (javascriptContext context = new JavascriptContext())
                {
                    foreach (UserInfo user in this.users)
                    {
                        context.SetParameter(“user”, user);
                        context.SetParameter(“isInclude”, false);
                        string js = string.Format(@”
                                                if({0})
                                                    isInclude=true;
                                                else
                                                    isInclude=false;”, jsFilter);
                        context.Run(js);
                        bool isInclude = (bool)context.GetParameter(“isInclude”);
                        if (isInclude)
                            results.Add(user);
                    }
                }
            }
            catch
            {
                txtFilter.Focus();
                txtFilter.SelectAll();
                return this.users;
            }

            return results;
        }

我们来看看效率：

复制代码 代码如下:

private void btnTest_Click(object sender, EventArgs e)

        {

            using (JavascriptContext context = new JavascriptContext())

            {

                Stopwatch sw = new Stopwatch();

                sw.Start();

                int i=1000000;

                while(i– > 0)

                {

                    context.SetParameter(“ii”, 1);

                    context.SetParameter(“jj”, 2);

                    context.SetParameter(“sum”, 0);

                    string js = string.Format(@”sum=ii+jj;”);

                    context.Run(js);

                    int sum = (int)context.GetParameter(“sum”);

                }

                sw.Stop();

                long useJS_Total = sw.ElapsedMilliseconds;
                float useJS_Average = ((float)sw.ElapsedMilliseconds) / 1000000;

                sw.Reset();
                sw.Start();
                i = 1000000;
                while (i– > 0)
                {
                    int ii = 1;
                    int jj = 2;
                    int sum = 0;
                    sum = ii + jj;
                }
                sw.Stop();

                long nouseJS_Total = sw.ElapsedMilliseconds;
                float nouseJS_Average = ((float)sw.ElapsedMilliseconds) / 1000000;

                string msg = “”;
                msg += string.Format(“useJS_Total: {0}\r\n”, useJS_Total);
                msg += string.Format(“useJS_Average: {0}\r\n\r\n\r\n”, useJS_Average);
                msg += string.Format(“nouseJS_Total: {0}\r\n”, nouseJS_Total);
                msg += string.Format(“nouseJS_Average: {0}\r\n\r\n\r\n”, nouseJS_Average);

                MessageBox.Show(msg);
            }
        }

结果（上面的是通过js引擎计算的时间、下面的是纯C#计算时间，悲剧啊）：这个noesis.Javascript只适用于性能要求不高的场合

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