I am trying to bind a list to a ComboBox and use displaymemberpath to display the values.

This is my XAML:

<ComboBox x:Name="ComboBoxCommissieGroep" 
           ItemsSource="{,c#,wpf,mvvm,data-binding,binding"/>
	














    

		

        

            
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首页  > 解决方案 > 列表中的组合框 DisplayMemberPath

I am trying to bind a list to a ComboBox and use displaymemberpath to display the values. 



This is my XAML:



<ComboBox x:Name="ComboBoxCommissieGroep" 
           ItemsSource="{












c# - 列表中的组合框 DisplayMemberPath

I am trying to bind a list to a ComboBox and use displaymemberpath to display the values. 



This is my XAML:



<ComboBox x:Name="ComboBoxCommissieGroep" 
           ItemsSource="{





问题描述



I am trying to bind a list to a ComboBox and use displaymemberpath to display the values. 



This is my XAML:



<ComboBox x:Name="ComboBoxCommissieGroep" 
           ItemsSource="{Binding Commissies}" 
           DisplayMemberPath="CommissieGroep">




ViewModel:



My ViewModel retreives a list of "Commissies"



private async Task LoadData()
{
    commissies = new ObservableCollection<object>(await LoginBLL.GetCommissiesList());
}




Model:



public class InloggenBO : ObservableObject
{
    private int lidNummer;

    public int LidNummer
    {
        get => lidNummer;
        set
        {
            lidNummer = value;
            NotifyPropertyChanged();
        }
    }

    private string commissieGroep;

    public string CommissieGroep
    {
        get => commissieGroep;
        set
        {
            commissieGroep = value;
            NotifyPropertyChanged();
        }
    }

    private string wachtwoord;

    public string Wachtwoord
    {
        get => wachtwoord;
        set
        {
            wachtwoord = value;
            NotifyPropertyChanged();
        }
    }
}




My code database method:
The method creates a list of a dataset that has been retrieved from the database. That is why it is of type object and not InloggenBO



protected Task<List<object>> ExecuteReader(string SqlString)
{
    // Read to dataset
    DataSet dataset = new DataSet();

    using (var conn = new SqlConnection(ConnectionString))
    using (var adapter = new SqlDataAdapter(new SqlCommand(SqlString, conn)
    {
        // Set commandtype
        CommandType = CommandType.Text
    }))
    {
        // Open connection
        conn.Open();
        // Fill dataset
        adapter.Fill(dataset);
        // Close connection
        conn.Close();
    }

    return Task.FromResult(ToList(dataset));
}




Method that creates the list object



private List<object> ToList(DataSet dataSet)
{
    var list = new List<object>();

    foreach (var dataRow in dataSet.Tables[0].Rows)
    {
        list.Add(dataRow);
    }
    return list;
}




I have set my DataContext to the viewmodel and I know that the binding works because in my combobox without the displaymemberpath it says: "System.Data.Datarow". So what do I have to put in the displaymemberpath so that I can show its value?







Printing textbox input to console with tkinter (python3.7)


I am making tic tac toe in python using tkinter, and the code all works except for when I try to print which player is the winner, I get the following ouput:



The player who won is:  
.!entry




The code I used to print out the winner is this:   



        print("The player who won is: ", e1_entry)
        ...




where e1_entry is defined as this:



e1_entry = e1.get()




and e1 is:



e1 = tkinter.Entry(window, textvariable=e1_entry)




How would I make it so that the text taken from the tkinter Entry is printed to the console?



Thanks



Gaurav Bhalla


标签： c#wpfmvvmdata-bindingbinding


解决方案









您可以将ToList方法更改为：



private List<InloggenBO> ToList(DataSet dataSet)
{
    //new list of InloggenBO instead of objects
    var list = new List<InloggenBO>();

    foreach (var dataRow in dataSet.Tables[0].Rows)
    {
        //create a new instance of InloggenBO
        var item = new InloggenBO();
        //this assumes that the column is named as the member
        item.CommissieGroep = dataRow["CommissieGroep"].ToString(); 
        //fill the other members

        //add the instane of InloggenBO to the list
        list.Add(item);
    }

    return list;
}




但是，正如@Andy 提到的，您应该考虑使用像实体框架这样的 ORM。










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