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  • Winform中ComcoBox控件设置选定项

    编写winform(C#.net)程序中使用下拉框控件时,无法指定选择项的解决办法
    首先定义类
      public  class ItemListHelp
        {
           public string text { get; set; }
           public string vlaue { get; set; }
        }

    然后绑定ComboBox控件
      DataTable ta=GetAllFieldByLetterType();
                if(ta!=null)
                {
                    drop_field.Items.Clear();
                  
                   
                    foreach(DataRow row in ta.Rows)
                    {
                        ItemListHelp item1=new ItemListHelp();
                        item1.text=row["fieldname"].ToString().Trim();
                        item1.vlaue=row["typename"].ToString().Trim();
                        if(item1.text!="")
                        drop_field.Items.Add(item1);
                    }
                    drop_field.DisplayMember = "text";
                    drop_field.ValueMember = "value";
                    //使第一项不为空
                    drop_field.SelectedIndex = 0;
                }
    这样绑定后ComcoBox的每一项都与ItemListHelp类相关联
    设定选择项
    //selectitem为要设定为选择项的显示文本
      if (selectitem != "")
                {
                    foreach (ItemListHelp item in drop_field.Items)
                    {
                        if (item.text == selectitem)
                        {
                            drop_field.SelectedItem = item;
                            break;
                        }
                    }

                }

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  • 原文地址:https://www.cnblogs.com/ldqwyl/p/2022625.html
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