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应用小算法

最近在做一个WPF小项目,因为需要处理一些数据,迫不得已写了一个函数,算是一个小算法吧,在此写出以便温故知新,同时希望牛人不吝赐教,点出其中不足之处。

 

简化需求:

创建一个datatable表dt,dt表中的记录行数是变量m。创建datatable表dt1、dt2,dt1和dt2循环显示dt中的数据,添加一个计时器定时刷新dt1、dt2中的数据,且dt1和dt2每次只能显示n行。

 

1、声明变量

private DispatcherTimer timer;        DataTable dt = new DataTable();        DataTable dt1 = new DataTable();        DataTable dt2 = new DataTable();        public static int currentRows = 0;//当前行        public static int currentRows2 = 0;//中间变量
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定时器:

timer = new DispatcherTimer();            timer.Interval = new TimeSpan(0, 0, 5);            timer.Tick += new EventHandler(timer_Tick);            timer.Start();
View Code

 

2、添加控件,此处添加两个datagrid控件(用以显示dt1和dt2中的数据)

<DataGrid AutoGenerateColumns="False" Height="335" HorizontalAlignment="Left" Margin="220,12,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="200" >            <DataGrid.Columns >                <DataGridTextColumn Header="id" Binding="{Binding Path=id}"></DataGridTextColumn>                <DataGridTextColumn Header="name" Binding="{Binding Path=name}"></DataGridTextColumn>            </DataGrid.Columns>        </DataGrid>        <DataGrid AutoGenerateColumns="False" Height="305" HorizontalAlignment="Left" Margin="463,31,0,0" Name="dataGrid2" VerticalAlignment="Top" Width="200" >            <DataGrid.Columns >                <DataGridTextColumn Header="id" Binding="{Binding Path=id}"></DataGridTextColumn>                <DataGridTextColumn Header="name" Binding="{Binding Path=name}"></DataGridTextColumn>            </DataGrid.Columns>        </DataGrid>
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3、创建datatable表dt,并且初始化dt1和dt2

private void Initialize(int num)        {            dt.Columns.Add(new DataColumn("id", typeof(int)));            dt.Columns.Add(new DataColumn("name", typeof(string)));            for (int i = 0; i < num; i++)            {                DataRow dr = dt.NewRow();                dr["id"] = i;                dr["name"] = "tom" + i.ToString();                dt.Rows.Add(dr);            }            dt1.Columns.Add(new DataColumn("id", typeof(int)));            dt1.Columns.Add(new DataColumn("name", typeof(string)));            dt2.Columns.Add(new DataColumn("id", typeof(int)));            dt2.Columns.Add(new DataColumn("name", typeof(string)));        }

初始化时调用:

Initialize(11);

 

4、编写函数

public void Update(int num)        {            int rows = dt.Rows.Count;            int num1 = 0;            int num2 = 0;            currentRows = currentRows2;            for (int i = currentRows; i < (currentRows + num); i++)            {                num1++;                currentRows2++;                DataRow dr = dt1.NewRow();                dr["id"] = Convert.ToInt32(dt.Rows[i][0].ToString());                dr["name"] = dt.Rows[i][1].ToString();                dt1.Rows.Add(dr);                if (i == rows - 1)                {                    i = -1;                    currentRows2 = 0;                }                if (num1 == num)                {                    break;                }            }            currentRows = currentRows2;            for (int i = currentRows; i < (currentRows + num); i++)            {                num2++;                currentRows2++;                DataRow dr = dt2.NewRow();                dr["id"] = Convert.ToInt32(dt.Rows[i][0].ToString());                dr["name"] = dt.Rows[i][1].ToString();                dt2.Rows.Add(dr);                if (i == rows - 1)                {                    i = -1;                    currentRows2 = 0;                }                if (num2 == num)                {                    break;                }            }        }

 

5、定时刷新dt1和dt2中的数据

void timer_Tick(object sender, EventArgs e)        {            dt1.Clear();            dt2.Clear();            Update(3);            this.dataGrid1.ItemsSource = dt1.DefaultView;            this.dataGrid2.ItemsSource = dt2.DefaultView;        }

 

应用小算法