silverlight 行为浅谈datagrid数据行上移下移

闲来无事，突然想到datagrid控件，虽然列能够拖动，但是行能不能拖动呢？上网查了点资料，让人郁闷的是，没有相关例子，于是狠心自己花了点时间写了一个简单的，虽然不能像列那样拖动，但是基本上也能实现行的上移下移了，废话少说，先看图：

思路：

一：加载数据：

　　由于比较简单，所以写了个简单的数据提供程序：

　　　　 public class Student
    {
        public int id { get; set; }
        public string name { get; set; }
    }

有一点我这里需要声明一下：我写的这个操作（Action）是附加在按钮上边的，以便操作数据的上移下移。

　　声明两个泛型列表，做数据源使用

private List<Student> data1 = new List<Student>();
private List<Student> data2 = new List<Student>();

接下来就是加载数据了

protected override void OnAttached()
        {
            base.OnAttached();
            (this.AssociatedObject as Button ).Loaded += new RoutedEventHandler(Action1_Loaded);
            (this.AssociatedObject as Button).Click += new RoutedEventHandler(Action1_Click);

}

       void Action1_Loaded(object sender, RoutedEventArgs e)
        {
            data1.Clear();
            init();
            (this.TargetSource as DataGrid).ItemsSource = data1;
        }

          public List <Student > init()
        {
            for (int a = 1; a < 10; a++)
            {
                Student stu = new Student();
                stu.id = a;
                stu.name = "姓名" + a.ToString();
                data1.Add(stu );

            }
            return data1;
        }

当然这里的 TargetSource 是我们要操作的datagrid，当然是同过依赖属性或附加属性传过来的，哪来看一下依赖属性

      #region 依赖属性
        /// <summary>
        /// 所附加的目标datagrid
        /// </summary>
        public static readonly DependencyProperty TargetSourceProperty =
           DependencyProperty.Register("TargetSource", typeof(System.Windows.Controls.DataGrid), typeof(Action1), null);
        public DataGrid TargetSource
        {
            get { return (DataGrid)GetValue(Action1.TargetSourceProperty); }
            set { SetValue(Action1.TargetSourceProperty, value); }
        }
        /// <summary>
        /// 0下移 1上移
        /// </summary>
        public static readonly DependencyProperty TargetTypeProperty =
           DependencyProperty.Register("TargetType", typeof(int ), typeof(Action1),new PropertyMetadata (0) );
        public int TargetType
        {
            get { return (int)GetValue(Action1.TargetTypeProperty); }
            set { SetValue(Action1.TargetTypeProperty, value); }
        }
        #endregion

因为比较简单，所以这里小弟就不多说了。

二：接下来肯定是点击按钮进行上移下移的操作了

　　　　先来看下xaml ：

接下来肯定是行为当中的操作了

void Action1_Click(object sender, RoutedEventArgs e)
        {
            DataGrid dg = this.TargetSource as DataGrid;
            index = dg.SelectedIndex;
            if (dg.SelectedIndex == -1)
            {
                MessageBox.Show("没有选择");
            }
            else
            {
                if (dg.SelectedIndex < data1.Count - 1 )
                {
                    //下移
                    if (this.TargetType == 0)
                    {
                        Student stu = data1[dg.SelectedIndex + 1];
                        data1[dg.SelectedIndex + 1] = data1[dg.SelectedIndex];
                        data1[dg.SelectedIndex] = stu;

                        dg.ItemsSource = updatedata(data1 );
                        index = index + 1;
                        dg.SelectedIndex = index;
                    }
                    else
                    {
                        //上移
                        if (dg.SelectedIndex != 0)
                        {
                            Student stu1 = data1[dg.SelectedIndex - 1];
                            data1[dg.SelectedIndex - 1] = data1[dg.SelectedIndex];
                            data1[dg.SelectedIndex] = stu1;

                            dg.ItemsSource = updatedata(data1);
                            index = index - 1;
                            dg.SelectedIndex = index;
                        }
                    }
                }

            }
        }
        List <Student> updatedata(List <Student > list)
        {
            data2.Clear();
            for (int a = 0; a < list.Count; a++)
            {
                data2.Add(list[a]);
            }
            return data2 ;
        }

　　　　整体写下来，总是感觉updatedata 这个方法又点多余，又兴趣的朋友可以自己去掉，原谅小弟懒惰，这里就不去了，哈哈.......................

整体没又难度，就算是我写博客练手把

代码：

　　xaml ：

行为代码：

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Interactivity;

namespace Actions
{
//
// 如果想针对元素而不是其父项来执行您的 Action，请
// 从 TargetedTriggerAction 中展开类，而不是从 TriggerAction 中展开类
//
public class Action1 : TargetedTriggerAction <UIElement>
    {
        #region 依赖属性
        /// <summary>
        /// 所附加的目标datagrid
        /// </summary>
        public static readonly DependencyProperty TargetSourceProperty =
           DependencyProperty.Register("TargetSource", typeof(System.Windows.Controls.DataGrid), typeof(Action1), null);
        public DataGrid TargetSource
        {
            get { return (DataGrid)GetValue(Action1.TargetSourceProperty); }
            set { SetValue(Action1.TargetSourceProperty, value); }
        }
        /// <summary>
        /// 0下移 1上移
        /// </summary>
        public static readonly DependencyProperty TargetTypeProperty =
           DependencyProperty.Register("TargetType", typeof(int ), typeof(Action1),new PropertyMetadata (0) );
        public int TargetType
        {
            get { return (int)GetValue(Action1.TargetTypeProperty); }
            set { SetValue(Action1.TargetTypeProperty, value); }
        }
        #endregion
        private List<Student> data1 = new List<Student>();
        private List<Student> data2 = new List<Student>();
        private int index = 0;//选中行的索引
        public Action1()
  {
   // 在此点下面插入创建对象所需的代码。

  }

  protected override void Invoke(object o)
  {
   // 插入代码以定义在触发/调用时 Action 将执行的操作。
  }
        protected override void OnAttached()
        {
            base.OnAttached();
            (this.AssociatedObject as Button ).Loaded += new RoutedEventHandler(Action1_Loaded);
            (this.AssociatedObject as Button).Click += new RoutedEventHandler(Action1_Click);

        }
        void Action1_Click(object sender, RoutedEventArgs e)
        {
            DataGrid dg = this.TargetSource as DataGrid;
            index = dg.SelectedIndex;
            if (dg.SelectedIndex == -1)
            {
                MessageBox.Show("没有选择");
            }
            else
            {
                if (dg.SelectedIndex < data1.Count - 1 )
                {
                    //下移
                    if (this.TargetType == 0)
                    {
                        Student stu = data1[dg.SelectedIndex + 1];
                        data1[dg.SelectedIndex + 1] = data1[dg.SelectedIndex];
                        data1[dg.SelectedIndex] = stu;

                        dg.ItemsSource = updatedata(data1 );
                        index = index + 1;
                        dg.SelectedIndex = index;
                    }
                    else
                    {
                        //上移
                        if (dg.SelectedIndex != 0)
                        {
                            Student stu1 = data1[dg.SelectedIndex - 1];
                            data1[dg.SelectedIndex - 1] = data1[dg.SelectedIndex];
                            data1[dg.SelectedIndex] = stu1;

                            dg.ItemsSource = updatedata(data1);
                            index = index - 1;
                            dg.SelectedIndex = index;
                        }
                    }
                }

            }
        }
        List <Student> updatedata(List <Student > list)
        {
            data2.Clear();
            for (int a = 0; a < list.Count; a++)
            {
                data2.Add(list[a]);
            }
            return data2 ;
        }
        void Action1_Loaded(object sender, RoutedEventArgs e)
        {
            data1.Clear();
            init();
            (this.TargetSource as DataGrid).ItemsSource = data1;
        }
       /// <summary>
       /// 绑定数据源
       /// </summary>
        public List <Student > init()
        {
            for (int a = 1; a < 10; a++)
            {
                Student stu = new Student();
                stu.id = a;
                stu.name = "姓名" + a.ToString();
                data1.Add(stu );

            }
            return data1;
        }
}

    public class Student
    {
        public int id { get; set; }
        public string name { get; set; }
    }
}

另外注意一点：如果行为当中用到datagrid 命名空间，请引用

System.Windows.Controls.Data

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原文地址：https://www.cnblogs.com/zhanlang/p/1877784.html