C# 组合框中的WPF选定值
我正在努力在我的DataGrid视图中使用ComboBox 我有两个可观察的集合。一个用于数据网格,其中DDV列表示Combobox的选定项,第二个用于Combobox的所有选项 可观测收集DDV_数据(所有组合框选项)位于ArtikliStoritveData的可观测收集中 我的WPF如下所示:C# 组合框中的WPF选定值,c#,wpf,mvvm,datagrid,combobox,C#,Wpf,Mvvm,Datagrid,Combobox,我正在努力在我的DataGrid视图中使用ComboBox 我有两个可观察的集合。一个用于数据网格,其中DDV列表示Combobox的选定项,第二个用于Combobox的所有选项 可观测收集DDV_数据(所有组合框选项)位于ArtikliStoritveData的可观测收集中 我的WPF如下所示: <DataGrid ItemsSource="{Binding Path=ArtikliStoritveData}" AutoGenerateColumns="False" Se
<DataGrid ItemsSource="{Binding Path=ArtikliStoritveData}" AutoGenerateColumns="False" SelectionMode="Single" CanUserAddRows="True" x:Name="dgArtikliStoritve" HorizontalAlignment="Left" Margin="31,58,0,0" VerticalAlignment="Top" Height="229" Width="612">
<DataGrid.Columns>
<DataGridTextColumn Header="Šifra" Binding="{Binding Sifra}" />
<DataGridTextColumn Header="Naziv" Binding="{Binding Naziv}" Width="200"/>
<DataGridTextColumn Header="Znesek" Binding="{local:CultureAwareBinding Path=Znesek, StringFormat={}{0:C}}"/>
<DataGridTextColumn Header="DDV" Binding="{local:CultureAwareBinding Path=DDV}" />
<DataGridTextColumn Header="EM" Binding="{Binding EM}" />
<DataGridTextColumn Header="Datum spremembe" Binding="{local:CultureAwareBinding Path=DatumSpremembe}" />
<DataGridTemplateColumn Header="DDV">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
SelectedValuePath="DDV"
DisplayMemberPath="DDV"
SelectedValue="{Binding DDV1}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding Artikel_ID}" Width="0" Visibility="Hidden"/>
<DataGridTextColumn Binding="{Binding SkupinaArtikla}" Width="0" Visibility="Hidden"/>
</DataGrid.Columns>
</DataGrid>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
DisplayMemberPath="DDV"
SelectedItem="{Binding Path=SelectedItem}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
SelectedItem = DDV_Data.Where(d => d.ID == someIdValue).Single();
ArtiklStoritve模型中的DDV属性:
public decimal DDV
{
get { return _ddv; }
set { _ddv = value; }
我还注意到,当我改变ComboBox中的值时,每一行的值都会改变
艺术史:
class ArtikliStoritve
{
#region private varaibles
int _artikel_id;
int _skupinaArtikla;
string _sifra;
string _naziv;
string _EM;
decimal _ddv;
decimal _znesek;
DateTime _datum_spremembe;
#endregion
#region properties
public int Artikel_ID
{
get { return _artikel_id; }
set { _artikel_id = value; }
}
public int SkupinaArtikla
{
get { return _skupinaArtikla; }
set { _skupinaArtikla = value; }
}
public string Sifra
{
get { return _sifra; }
set { _sifra = value; }
}
public string EM
{
get { return _EM; }
set { _EM = value; }
}
public string Naziv
{
get { return _naziv; }
set { _naziv = value; }
}
public decimal DDV1
{
get { return _ddv; }
set { _ddv = value; }
}
public decimal Znesek
{
get { return _znesek;}
set { _znesek = value; }
}
public DateTime DatumSpremembe
{
get { return _datum_spremembe; }
set { _datum_spremembe = value; }
}
private decimal _SelectedItem;
public decimal SelectedItem
{
get { return _SelectedItem; }
set { _SelectedItem = value; }
}
private ObservableCollection<DDV_Class> _DDV_Data = new ObservableCollection<DDV_Class>();
public ObservableCollection<DDV_Class> DDV_Data
{
get { return _DDV_Data; }
set { _DDV_Data = value; }
}
#endregion
}
private DDV_Class _SelectedItem;
public DDV_Class SelectedItem
{
get { return _SelectedItem; }
set { _SelectedItem = value; }
}
我在ArtikliStoritveViewModel中填写:
for (int i = 0; i < dtDDV.Rows.Count; i++)
{
DDV_Data1.Add(new DDV_Class
{
ID = Convert.ToInt32(dtDDV.Rows[i]["ID"].ToString()),
DDV = Convert.ToDecimal(dtDDV.Rows[i]["DDV"].ToString())
});
}
填充时:
for (int i = 0; i < dt.Rows.Count; ++i)
{
ArtikliStoritveData.Add(new ArtikliStoritve
{
Artikel_ID = Convert.ToInt32(dt.Rows[i]["artikel_id"].ToString()),
SkupinaArtikla = Convert.ToInt32(dt.Rows[i]["skupina_artikla"].ToString()),
Sifra = dt.Rows[i]["sifra"].ToString(),
EM = dt.Rows[i]["em"].ToString(),
Naziv = dt.Rows[i]["naziv"].ToString(),
DDV1 = Convert.ToDecimal(dt.Rows[i]["ddv"].ToString()),
DDV_Data = DDV_Data1,
SelectedItem = new DDV_Class { ID = 1, DDV = 22.0m },
Znesek = Decimal.Parse(dt.Rows[i]["znesek"].ToString()),
DatumSpremembe = DateTime.Parse(dt.Rows[i]["date_changed"].ToString())
});
}
WPF如下所示:
<DataGrid ItemsSource="{Binding Path=ArtikliStoritveData}" AutoGenerateColumns="False" SelectionMode="Single" CanUserAddRows="True" x:Name="dgArtikliStoritve" HorizontalAlignment="Left" Margin="31,58,0,0" VerticalAlignment="Top" Height="229" Width="612">
<DataGrid.Columns>
<DataGridTextColumn Header="Šifra" Binding="{Binding Sifra}" />
<DataGridTextColumn Header="Naziv" Binding="{Binding Naziv}" Width="200"/>
<DataGridTextColumn Header="Znesek" Binding="{local:CultureAwareBinding Path=Znesek, StringFormat={}{0:C}}"/>
<DataGridTextColumn Header="DDV" Binding="{local:CultureAwareBinding Path=DDV}" />
<DataGridTextColumn Header="EM" Binding="{Binding EM}" />
<DataGridTextColumn Header="Datum spremembe" Binding="{local:CultureAwareBinding Path=DatumSpremembe}" />
<DataGridTemplateColumn Header="DDV">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
SelectedValuePath="DDV"
DisplayMemberPath="DDV"
SelectedValue="{Binding DDV1}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding Artikel_ID}" Width="0" Visibility="Hidden"/>
<DataGridTextColumn Binding="{Binding SkupinaArtikla}" Width="0" Visibility="Hidden"/>
</DataGrid.Columns>
</DataGrid>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
DisplayMemberPath="DDV"
SelectedItem="{Binding Path=SelectedItem}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
SelectedItem = DDV_Data.Where(d => d.ID == someIdValue).Single();
结果和上面显示的图片一样
-->更新
当我在一行中更改comboBox中的值时,我明白了为什么所有行中的值都会更改。问题vas,因为我在每行添加了一个可观察集合的距离:
DDV_Data1不是为每行实例化的,因此这是一个问题-所有行中都有一个对象:
DataTable dtDDV = myDDV_DAL.getAll();
if (dtDDV.Rows.Count > 0)
{
for (int i = 0; i < dtDDV.Rows.Count; i++)
{
DDV_Data1.Add(new DDV_Class
{
ID = Convert.ToInt32(dtDDV.Rows[i]["ID"].ToString()),
DDV = Convert.ToDecimal(dtDDV.Rows[i]["DDV"].ToString())
});
}
}
ArtikliStoritveDAL myArtikliStoritveDAL = new ArtikliStoritveDAL();
DataTable dt = myArtikliStoritveDAL.getAll();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; ++i)
{
ArtikliStoritveData.Add(new ArtikliStoritve
{
...
DDV_Data = DDV_Data1,
...
DataTable dtDDV=myDDV_DAL.getAll();
如果(dtDDV.Rows.Count>0)
{
对于(int i=0;i0)
{
对于(int i=0;i
我在另一个专栏上进行了测试,现在这一功能正在发挥作用:
EM_DAL myEM_DAL = new EM_DAL();
DataTable dtEM = myEM_DAL.getAll();
if (dtEM.Rows.Count > 0)
{
for (int i = 0; i < dtEM.Rows.Count; i++)
{
EM_Data.Add(new EM_Model
{
ID = dtEM.Rows[i]["EM"].ToString(),
Naziv = dtEM.Rows[i]["EM"].ToString()
});
}
}
ArtikliStoritveDAL myArtikliStoritveDAL = new ArtikliStoritveDAL();
DataTable dt = myArtikliStoritveDAL.getAll();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; ++i)
{
ArtikliStoritveData.Add(new ArtikliStoritve
{
...
EM_Data = getAll(dt.Rows[i]["em"].ToString()),
...
public List<EM_Model> getAll(string p_selected)
{
List<EM_Model> myEM_Model = new List<EM_Model>();
string strConnString = Util.getConnectionString();
try
{
NpgsqlConnection conn = new NpgsqlConnection(strConnString);
DataTable dt = new DataTable();
conn.Open();
NpgsqlDataAdapter da = new NpgsqlDataAdapter("SELECT em, em "
+ " FROM em", conn);
da.Fill(dt);
conn.Close();
for (int i = 0; i < dt.Rows.Count; i++)
{
myEM_Model.Add(new EM_Model
{
ID = dt.Rows[i]["EM"].ToString(),
Naziv = dt.Rows[i]["EM"].ToString(),
SelectedItem1 = p_selected
});
}
return myEM_Model;
EM_DAL myEM_DAL=新的EM_DAL();
DataTable dtEM=myEM_DAL.getAll();
如果(dtEM.Rows.Count>0)
{
对于(int i=0;i0)
{
对于(int i=0;i
现在我必须弄清楚为什么在comboBox中没有选择is value。我使用在comboBox的所有选项都为(getAll())的对象或集合ArtikliStoritveData中创建的选定值进行了测试。两者都不起作用
继续搜索正确的解决方案…:)
如果我将serach contect放在一行,Snoop会向我显示以下内容(正确):
如果在WPF中执行此操作,则组合框中的选定值是列表中的第一个值,而不是正确的值:
<ComboBox
x:Name="cmbEM"
ItemsSource="{Binding EM_Data}"
DisplayMemberPath="Naziv"
SelectedItem="{Binding EM}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
最后,我找到了一个解决方案。SelectedValue和SelectedValuePath的结合成功了
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
DisplayMemberPath="DDV"
SelectedValue="{Binding DDV, Mode=TwoWay}"
SelectedValuePath="DDV"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
在网上,我发现了一些对我有帮助的信息
问候,,
Igor我想我可以看到您的错误所在…当数据绑定到组合框时。SelectedItem属性,有几点需要注意。第一点是绑定到
SelectedItem
属性的对象数据必须与绑定到ItemsSource
属性的集合中的项具有相同的类型
从您的代码中,似乎绑定到ItemsSource
属性的数据集合属于自定义类的类型……您没有显示,但我猜是因为您将DisplayMemberPath
的值设置为Naziv
。因此您需要将数据绑定到DDV
属性SelectedItem
属性的类型与集合中的项相同,或者您可以尝试使用组合框。SelectedValue
属性与SelectedValuePath
属性组合使用:
<ComboBox x:Name="cmbDDV"
ItemsSource="{Binding Path=DDV_Data}"
DisplayMemberPath="Naziv"
SelectedValuePath="Naziv"
IsSynchronizedWithCurrentItem="True"
SelectedValue="{Binding Path=DDV}"
Width="50" />
这里有几点需要注意,以备将来使用……如果要设置组合框。请从代码中选择EdItem
,设置为值的项必须是绑定到组合框的集合中的实际项。ItemsSource
属性。您可以这样做:
<DataGrid ItemsSource="{Binding Path=ArtikliStoritveData}" AutoGenerateColumns="False" SelectionMode="Single" CanUserAddRows="True" x:Name="dgArtikliStoritve" HorizontalAlignment="Left" Margin="31,58,0,0" VerticalAlignment="Top" Height="229" Width="612">
<DataGrid.Columns>
<DataGridTextColumn Header="Šifra" Binding="{Binding Sifra}" />
<DataGridTextColumn Header="Naziv" Binding="{Binding Naziv}" Width="200"/>
<DataGridTextColumn Header="Znesek" Binding="{local:CultureAwareBinding Path=Znesek, StringFormat={}{0:C}}"/>
<DataGridTextColumn Header="DDV" Binding="{local:CultureAwareBinding Path=DDV}" />
<DataGridTextColumn Header="EM" Binding="{Binding EM}" />
<DataGridTextColumn Header="Datum spremembe" Binding="{local:CultureAwareBinding Path=DatumSpremembe}" />
<DataGridTemplateColumn Header="DDV">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
SelectedValuePath="DDV"
DisplayMemberPath="DDV"
SelectedValue="{Binding DDV1}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding Artikel_ID}" Width="0" Visibility="Hidden"/>
<DataGridTextColumn Binding="{Binding SkupinaArtikla}" Width="0" Visibility="Hidden"/>
</DataGrid.Columns>
</DataGrid>
<DataTemplate>
<ComboBox
x:Name="cmbDDV"
ItemsSource="{Binding DDV_Data}"
DisplayMemberPath="DDV"
SelectedItem="{Binding Path=SelectedItem}"
IsSynchronizedWithCurrentItem="True"
Width="50"
/>
</DataTemplate>
SelectedItem = DDV_Data.Where(d => d.ID == someIdValue).Single();
此外,您应该在Visual Studio的输出窗口中显示一些错误…类似于:
System.Windows.Data错误:40:BindingExpression路径错误:“在”“对象”“数据边界对象的名称”“(名称=“”)”上找不到某些属性。BindingExpression:path=SomePath;DataItem='DataBoundObject的名称”“(名称=“”);目标元素为'TypeOfIELEment'(名称=“”);目标属性为'PropertyName'(类型为'TypeOfProperty')
这些都是有价值的线索……请注意它们,因为它们有助于你追踪你的问题。我在问题的末尾添加了解决方案 问候,,
Igor看起来像是
DDV_数据
不是绑定到网格行的数据项的属性。如果您查看Visual Studio中的输出窗口,您将看到绑定错误。我在输出窗口中没有任何错误。我发布了一段代码,证明DDV_数据是collec的一部分