[英]How can I create as many of the same databound comboboxes but pull different values from the same fieldname?
我希望這個例子能讓這個問題變得更加清晰。 基本上,我有一類鋼角(我需要知道它們的寬度和厚度)。 我想從.csv加載它們,並創建k <count所需的數量。
第一個例子:
XAML
<DataGridTemplateColumn x:Name="cBoxes" Header="Size" Width="*" CanUserReorder="False" CanUserSort="False" CanUserResize="False" IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox x:Name="testBox" Margin="2" ItemsSource="{Binding eID}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
代碼背后
public class Angles
{
public double TYPE { get; set; }
public string eID { get; set; }
public double WIDTH { get; set; }
public ObservableCollection<double> THICKNESS { get; set; }
}
private ObservableCollection<Angles> angleDb = new ObservableCollection<Angles>();
private ObservableCollection<string> angleIDStrings = new ObservableCollection<string>();
public void LoadAngles()
{
var wn = Convert.ToDouble(textboxWebNumber.Text);
var twn = wn % 2 == .5 ? wn + (wn / 2 - .5) + 6 : wn + (Math.Floor(wn / 2)) + 6;
var csvColl = (from line in File.ReadAllLines("angledb.csv").Skip(1)
let parts = line.Split(',')
select new
{
Width = Convert.ToDouble(parts[0]),
Thickness = Convert.ToDouble(parts[1])
}).ToList();
foreach (var item in csvColl)
{
var content = $"L{item.Width}x{item.Width}x{item.Thickness}";
angleIDStrings.Add(content);
angleDb.Add(new Angles() {
THICKNESS = item.Thickness, WIDTH = item.Width, eID = angleIDStrings });
}
DataContext = angleDb;
}
其邏輯基本上用所有可能的角度eID或角度尺寸的所有可能變化加載每個角度。 這實際上做了我想要的,除了數據網格填充了與eID或eID.Count一樣多的組合框。
第二個例子應該讓我更清楚:
public class Angles
{
public double TYPE { get; set; }
public ObservableCollection<string> eID { get; set; }
public ObservableCollection<double> WIDTH { get; set; }
public ObservableCollection<double> THICKNESS { get; set; }
} // modify the class, changing all fields to observablecollections
private ObservableCollection<double> angleWidths = new ObservableCollection<double>();
private ObservableCollection<double> angleThicknesses = new ObservableCollection<double>();
public List<Angles> finalList = new List<Angles>();
public void LoadAngles()
{
var wn = Convert.ToDouble(textboxWebNumber.Text);
var twn = wn % 2 == .5 ? wn + (wn / 2 - .5) + 6 : wn + (Math.Floor(wn / 2)) + 6;
// Read each line, break it at commas, assign split-elements, save into a list.
var csvColl = (from line in File.ReadAllLines("angledb.csv").Skip(1)
let parts = line.Split(',')
select new
{
Width = Convert.ToDouble(parts[0]),
Thickness = Convert.ToDouble(parts[1])
}).ToList();
foreach (var item in csvColl)
{
var content = $"L{item.Width}x{item.Width}x{item.Thickness}";
angleIDStrings.Add(content);
angleThicknesses.Add(item.Thickness);
angleWidths.Add(item.Width);
}
for (var k = 0; k < twn; k++)
{
angleDb.Add(new Angles
{
THICKNESS = angleThicknesses,
WIDTH = angleWidths,
eID = angleIDStrings
});
}
DataContext = angleDb;
}
這里的邏輯基本上是設置一個“模板”角度,每個角度都有可能的變化,並根據k <twn添加它們
這將生成盡可能多的組合框,但在嘗試從中拉出SelectedValue時會出現問題。
我怎樣才能找到中間解決方案?
你的問題是糟糕的設計 - 你應該使用MVVM模式。
但簡單的解決方案是:XAML
<DataGridTemplateColumn x:Name="cBoxes" Header="Size" Width="*" CanUserReorder="False" CanUserSort="False" CanUserResize="False" IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox x:Name="testBox" Margin="2" SelectedItem="{Binding SelectedEID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ItemsSource="{Binding eID}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
C#
public class Angles
{
public double TYPE { get; set; }
public string SelectedEID { get; set; }
public ObservableCollection<string> eID { get; set; }
public ObservableCollection<double> WIDTH { get; set; }
public ObservableCollection<double> THICKNESS { get; set; }
}
顯然, Angles
class
現在有一個新的Property
來保存SelectedItem
。
無論如何看看這個鏈接
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