获取元素ID使用类名与C中具有相同类名称的多个元素＃

Question

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 
    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
      textBox10.Text = link.GetAttribute("id"); 
     } 
    } 
} 

结果：我只得到第4个元素id的id与4个元素中的同一个类。现在如何获得3元素id的其余部分？

Answer 1

您覆盖与循环的每个迭代的文本值。

更新代码：

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 

    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
       textBox10.Text += link.GetAttribute("id"); 
     } 
    } 
} 

如果你想说的话放，如果他们在不同的文本框中存在找到了前四个项目，那么你就需要来填充列表，然后引用它，像这样：

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 
    List<String> results = new List<String>(); 
    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
       results.Add(link.GetAttribute("id")); 
     } 
    } 
    textbox10.Text = results[0]; 
    textbox11.Text = results[1]; etc.... 
} 

使用LINQ使得一个更优雅的解决方案：

//需要使用System.Linq的

String[] results = (from itm in links where itm.GetAttribute("className") == "input-style1 psgn-name" select itm.GetAttribute("id")).ToArray(); 

然后用数组元素填充你的方框。

Answer 2

在您的文本框中，您每次都会覆盖该ID。您需要连接文本框中的字符串。所以...

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 
    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
      textBox10.Text += link.GetAttribute("id") + ","; 
     } 
    } 

    // Remove last comma 
    if(!string.IsNullOrWhiteSpace(textBox10.Text)){ 
     textBox10.Text = textBox10.Text.Substring(0, textBox10.Text.Length - 1); 
    } 
} 

现在在您的文本框中，您可以看到以逗号分隔的元素的ID列表。

如果你想设置不同的文本框：

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 
    int i = 10; 
    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
      foreach(Control ctrl in Controls) 
      { 
       if (ctrl is TextBox){ 
        TextBox tb = (CheckBox)c; 
        if(tb.Name == "textBox" + i) { 
         i++; 
         tb.Text = link.GetAttribute("id"); 
        } 
       } 
      } 
     } 
    } 
} 

或者

private void button5_Click(object sender, EventArgs e) 
{ 
    HtmlElementCollection links = webBrowser1.Document.GetElementsByTagName("input"); 
    int i = 10; 
    foreach (HtmlElement link in links) 
    { 
     if (link.GetAttribute("className")== "input-style1 psgn-name") 
     { 
      TextBox tb = Controls.Find("textBox" + i) as TextBox; 
      i++; 

      if(tb != null) { 
       tb.Text = link.GetAttribute("id"); 
      } 
     } 
    } 
}