图表数据绑定到数据表 - 表不更新 [英] Chart DataBinding to DataTable - Chart Not Updating
问题描述
我试图数据绑定一个图
到数据表
。我想,因为它们被添加的图表来显示新的行,但是,当新的行被添加到表中的图表没有更新。我已经验证这两个表
和 tableDataSource
包含新行,但 chart.Series [ TestTable的。Points.Count
从不 5
改变。
样code,基于问题无法绑定数据表到图表控制时,如下所示。我要么想知道是否有错误或遗漏与下面的code或不同的,更好的方法,达到同样的目标。我知道如何手动添加指向系列
,但我想看看如何做到这一点使用数据绑定。
随机R =新的随机();
定时器定时器=新的Timer();
数据表表=新的DataTable(TestTable的);
日期时间日期=新的日期时间(2013年1,1);
IList的tableDataSource = NULL;无效timer_Tick(对象发件人,EventArgs的发送)
{
table.Rows.Add(日期,r.NextDouble());
日期= date.AddDays(1); chart.Update();
}无效MainForm_Load(对象发件人,EventArgs的发送)
{
table.Columns.Add(日期的typeof(DateTime的));
table.Columns.Add(百分比中的typeof(双)); 的for(int i = 0;我小于5;我++)
{
table.Rows.Add(日期,r.NextDouble());
日期= date.AddDays(1);
} tableDataSource =(表作为IListSource).GetList();
chart.DataBindTable(tableDataSource,日期); timer.Interval = 500;
timer.Tick + =新的EventHandler(timer_Tick);
timer.Start();
}
尝试使用表作为数据源,而不是:
// tableDataSource =(表作为IListSource).GetList();
// chart.DataBindTable(tableDataSource,日期);chart.Series.Add(测试);
chart.Series [测试] = XValueMember日期。
chart.Series [测试] = YValueMembers百分比。
chart.DataSource =表;
chart.DataBind();
然后在Tick事件,再次调用DataBind,而不是更新:
无效timer_Tick(对象发件人,EventArgs的发送){
table.Rows.Add(日期,r.NextDouble());
日期= date.AddDays(1); //chart.Update();
chart.DataBind();
}
I'm attempting to databind a Chart
to a DataTable
. I would like the chart to display new rows as they are added, but the chart is not updating when new rows are added to the table. I have verified that both table
and tableDataSource
contain the new rows, but chart.Series["TestTable"].Points.Count
never changes from 5
.
Sample code, based on the question Can't bind datatable to Chart Control, is shown below. I would either like to know if there is an error or omission with the code below, or a different, better approach that achieves the same objective. I know how to manually add points to a Series
, but I would like to see how to do this using data binding.
Random r = new Random();
Timer timer = new Timer();
DataTable table = new DataTable("TestTable");
DateTime date = new DateTime(2013, 1, 1);
IList tableDataSource = null;
void timer_Tick(object sender, EventArgs e)
{
table.Rows.Add(date, r.NextDouble());
date = date.AddDays(1);
chart.Update();
}
void MainForm_Load(object sender, EventArgs e)
{
table.Columns.Add("Date", typeof(DateTime));
table.Columns.Add("Percent", typeof(double));
for (int i = 0; i < 5; i++)
{
table.Rows.Add(date, r.NextDouble());
date = date.AddDays(1);
}
tableDataSource = (table as IListSource).GetList();
chart.DataBindTable(tableDataSource, "Date");
timer.Interval = 500;
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
Try using the table as a DataSource instead:
// tableDataSource = (table as IListSource).GetList();
// chart.DataBindTable(tableDataSource, "Date");
chart.Series.Add("test");
chart.Series["test"].XValueMember = "Date";
chart.Series["test"].YValueMembers = "Percent";
chart.DataSource = table;
chart.DataBind();
and then in the tick event, call DataBind again instead of the Update:
void timer_Tick(object sender, EventArgs e) {
table.Rows.Add(date, r.NextDouble());
date = date.AddDays(1);
//chart.Update();
chart.DataBind();
}
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