利用noesis.Javascript开源组件.Net中执行javascript脚本

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）

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：

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

到此这篇关于利用noesis.Javascript开源组件.Net中执行javascript脚本就介绍到这了。流过泪的眼睛更明亮，滴过血的心灵更坚强！更多相关利用noesis.Javascript开源组件.Net中执行javascript脚本内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！