限制mvc 2中列表框的项目长度

发布于 2024-10-19 02:45:12 字数 314 浏览 2 评论 0原文

在我的 MVC 2 应用程序中，我有一个列表框，

<%: Html.ListBoxFor(m => m.SelectedQuestionIds[cnt1], Model.QuestionList, new { @class = "list_style" })%>

我使用“list_style”样式限制了列表框的宽度。

我的问题是列表框中的某些项目的长度大于列表框的宽度。如果长度太长，我需要限制用“...”显示的项目的长度。所以我的文字将是“你好吗……” “你好吗，我亲爱的朋友，你还好吗！” 谢谢，问候

原文

In my MVC 2 application i ahve a list box

<%: Html.ListBoxFor(m => m.SelectedQuestionIds[cnt1], Model.QuestionList, new { @class = "list_style" })%>

i have limited my list box width with the style "list_style".

my problem is that some of the item in my listbox has length greater than my listbox width.
i need to limit the length of the item shown with a '...' if the length is too long.
so my text will be 'how are you ...'
for 'How are you my dear friend are u okay!'
thanks,
regards

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面如桃花 2024-10-26 02:45:12

您应该将其放在扩展方法中，例如

public static class StringExtensions {

  public static string TrimLength(this String text, int length) {
    if (text != null && text.Length > length) {
      return text.Substring(0, length - 1);
    }
    return text;
  }

  public static string TrimLengthWithEllipsis(this String text, int length) {
    if (text != null) {
      return TrimLength(text, length) + "..."; 
    }
    return text;
  }

}

然后您可以使用

model.QuestionList = from question in model.Questions
                                     select new SelectListItem
                                     {
                                         Text=question.QuestionDescription.TrimLengthWithEllipses(48),
                                         Value=question.QuestionID.ToString()
                                     };

更干净且更可重用的方法。

You should put this in an extension method, something like

public static class StringExtensions {

  public static string TrimLength(this String text, int length) {
    if (text != null && text.Length > length) {
      return text.Substring(0, length - 1);
    }
    return text;
  }

  public static string TrimLengthWithEllipsis(this String text, int length) {
    if (text != null) {
      return TrimLength(text, length) + "..."; 
    }
    return text;
  }

}

Then you can use

model.QuestionList = from question in model.Questions
                                     select new SelectListItem
                                     {
                                         Text=question.QuestionDescription.TrimLengthWithEllipses(48),
                                         Value=question.QuestionID.ToString()
                                     };

Much cleaner and more reusable.

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你不是我要的菜∠ 2024-10-26 02:45:12

idid这个：

model.QuestionList = from question in model.Questions
                                         select new SelectListItem
                                         {
                                             Text=question.QuestionDescription.Length>48?question.QuestionDescription.Substring(0,47)+" ...":question.QuestionDescription,
                                             Value=question.QuestionID.ToString()
                                         };

idid this:

model.QuestionList = from question in model.Questions
                                         select new SelectListItem
                                         {
                                             Text=question.QuestionDescription.Length>48?question.QuestionDescription.Substring(0,47)+" ...":question.QuestionDescription,
                                             Value=question.QuestionID.ToString()
                                         };

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