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我有幾個複選框(其中content =數據庫中的名稱)。在metchod checkbox_checked中,試圖將ColumnSeries添加到wpf Chart,但仍然出現錯誤: 「對象引用未設置爲對象的實例。」添加ItemsSource到wpf圖表中的ColumnSeries時出錯
這裏是XAML代碼:
<DVC:Chart Canvas.Top="80" Canvas.Left="10" Name="wykres1" Background="LightSteelBlue">
</DVC:Chart>
和代碼隱藏:
CheckBox c = (CheckBox)sender;
ColumnSeries b = new ColumnSeries();
b.Title = c.Content.ToString();
b.ItemsSource = null;
b.ItemsSource =
new KeyValuePair<string, int>[]{
new KeyValuePair<string, int>("Project Manager", 12),
new KeyValuePair<string, int>("CEO", 25),
new KeyValuePair<string, int>("Software Engg.", 5),
new KeyValuePair<string, int>("Team Leader", 6),
new KeyValuePair<string, int>("Project Leader", 10),
new KeyValuePair<string, int>("Developer", 4) };
wykres1.Series.Add(b);
categoryList.Add(c.Tag.ToString());
任何人都可以幫助嗎? :)