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
View Code

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>
View Code

 

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);

            

        }

 

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