怎样删除dropdownlist中value中符合条件的项

Question

删除dropdownlist中vlaue符合条件的项
我这样写了不对
for (int i = 0; i < DropDownList3.Items.Count; i++)
            {
                if (DropDownList3.Items[i].Value.Contains(“11”))
                {
                    DropDownList3.Items.RemoveAt(i);
                }
            }
由于删除了一个后，项的为止发生了变化

Answer 1

for (int i = DropDownList3.Items.Count; i >= 0; i--) 
            { 
                if (DropDownList3.Items[i].Value.Contains(“11”)) 
                { 
                    DropDownList3.Items.RemoveAt(i); 
                } 
            }

Answer 2

试试从最后一个项开始遍历:
            for (int i = DropDownList3.Items.Count - 1; i >= 0; i--)
            {
                if (DropDownList3.Items[i].Value.Contains(“11”))
                {
                    DropDownList3.Items.RemoveAt(i);
                }
            } 

Answer 3

怎么我的环境里面DropDownList3.Items[i].Value.Contains(“11”)) 不能编译通过？Value有Contains这个方法吗？

Answer 4

给你个提示解决下,可以和listview相似：/// <summary>
        /// 去掉选择项
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void plusselected_Click(object sender, EventArgs e)
        {
            foreach (ListItem item in TargetFile.Items)
            {
                if (item.Selected == true)
                {
                    SourceFile.Items.Add(item);
                    item.Selected = false;
                }
            }
            foreach (ListItem item in SourceFile.Items)
            {
                TargetFile.Items.Remove(item);
            }
        }

Answer 5

 foreach (ListItem item in ddlTest.Items) 
        {
            if (item.Text.Contains("6")) 
            {
                ddlTest.Items.Remove(item);
                break;
            }
        }

Answer 6

for (int i = 0; i < DropDownList3.Items.Count; i++) 
            { 
                if (DropDownList3.Items[i].Value.Contains(“11”)) 
                { 
                    DropDownList3.Items.RemoveAt(i); 
                    i--;
                } 
            } 

Answer 7

有条件的选择结束,和变量的递增for (int i = 0; i < DropDownList3.Items.Count; ) 
            { 
                if (DropDownList3.Items[i].Value.Contains(“11”)) 
                { 
                    DropDownList3.Items.RemoveAt(i); 
                } 
                else{
                  i++;
                 }
            }