【ListBox】ListBox的相关操作

Winform中两个listbox的操作是平时比较常用的操作。

本次将以一个Winform实例来分享一下两个listbox的操作，包括：listbox添加项，项的上移下移等操作。

假设有两个listbox:一个叫listBoxCategory，这个listbox是一个包含所有建筑元素项目的项；另一个叫listBoxSelected，这个是将左边的listbox中的项选中并添加到的listbox。

<1> Resource文件的定义：

<2> listBox中的每一项定义：

public class CategoryItem

    {

       public CategoryItem(string categoryName, int categoryId)

       {

           CategoryName = categoryName;

           CategoryId = categoryId;

       }

       public string CategoryName  {get; set;}

       public int CategoryId  {get; set;}

    }

<3> listBoxCategoery在初始化时，它的每一项都是由doc.Settings.Categories提供，但是不能和listBoxSelected中的初始项冲突；listBoxSelected中的初始项由Existinglist提供

 private void listboxInitialize(Document doc)

        {

            List<CategoryItem> categoryitems = new List<CategoryItem>();

            listBoxCategory.DisplayMember = "CategoryName";

            listBoxCategory.ValueMember = "id";

            listBoxSelected.DisplayMember = "CategoryName";

            listBoxSelected.ValueMember = "id";

            foreach (Category cat in doc.Settings.Categories)

            {

                bool checkreapter = false;

                foreach(int defaultlistId in Existinglist)

                {

                     if(cat.Id.IntegerValue==defaultlistId)

                     {

                         checkreapter = true; break;

                     }

                }

                if(checkreapter == false)

                {

                    listBoxCategory.Items.Add(new CategoryItem(cat.Name, cat.Id.IntegerValue));  //防止和listBoxSelected中的项冲突

                }

            }

            foreach (int defaultlistId in Existinglist)

            {

                listBoxSelected.Items.Add(new CategoryItem(doc.Settings.Categories.get_Item((BuiltInCategory)defaultlistId).Name, defaultlistId));

            }

        }

<4> listBoxSeleted的上移与下移：

private void buttonUp_Click(object sender, EventArgs e)

        {

            int listboxLength = listBoxSelected.Items.Count;

            int selectindex = listBoxSelected.SelectedIndex;

            if (listBoxSelected.SelectedItem !=null)

            {

                if (listboxLength > selectindex && selectindex > )

                {

                    object oTempItem = listBoxSelected.SelectedItem;

                    listBoxSelected.Items.RemoveAt(selectindex);

                    listBoxSelected.Items.Insert(selectindex - , oTempItem);

                    listBoxSelected.SelectedIndex = selectindex - ;

                }

            }

            else

            {

                MessageBox.Show(Res.StringReminder);

            }

        }

        private void buttonDown_Click(object sender, EventArgs e)

        {

            int listboxLength = listBoxSelected.Items.Count;

            int selectindex = listBoxSelected.SelectedIndex;

            if (listBoxSelected.SelectedItem !=null)

            {

               if (listboxLength > selectindex && selectindex < listboxLength - )

               {

                   object oTempItem = listBoxSelected.SelectedItem;

                   listBoxSelected.Items.RemoveAt(selectindex);

                   listBoxSelected.Items.Insert(selectindex + , oTempItem);

                   listBoxSelected.SelectedIndex = selectindex + ;

               }

            }

            else

            {

                MessageBox.Show(Res.StringReminder);

            }

        }

<5> 将listBoxCategory中的项添加到listBoxSelected：

 private void buttonAdd_Click(object sender, EventArgs e)

        {

             listBoxSelected.DisplayMember = "CategoryName";

             listBoxSelected.ValueMember = "id";

             bool checklist = false;

             if (listBoxCategory.SelectedItem !=null)

             {

                 foreach(object obj in listBoxSelected.Items)

                 {

                      if (((CategoryItem)listBoxCategory.SelectedItem).CategoryName == ((CategoryItem)obj).CategoryName)

                      {

                          checklist = true;

                          break;

                      }

                 }

                 if(checklist==true)

                 {

                     MessageBox.Show(Res.StringRepeat);

                 }

                 else

                 {

                     for (int i = listBoxCategory.SelectedItems.Count - ; i >= ; i--)

                     {

                         listBoxCategory.SelectedItem = listBoxCategory.SelectedItems[i];

                         listBoxSelected.Items.Add(listBoxCategory.SelectedItem);

                         listBoxCategory.Items.Remove(listBoxCategory.SelectedItem);

                     }

                 }

             }

             else

             {

                   MessageBox.Show(Res.StringReminder);

             }

        }

<6> listBoxcategory中的项双击添加到listBoxSelected中：

private void listBoxCategory_DoubleClick(object sender, EventArgs e)

        {

               buttonAdd.PerformClick();

        }

巴特西

【ListBox】ListBox的相关操作

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