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我希望得到一些關於我在代碼中缺少的指針。
我有一個文本框綁定到對象屬性是列表中的一個項目，如果我請求列表中的另一個項目，該值不會更新窗體上。Winforms雙向數據綁定：強制更新字段
要與下面的例子說明：
txtGain值openJSONRequestFileToolStripMenuItem_Click機能的研究後填充
一旦我選擇不同的cmbSignals組合框的東西，我希望因爲SelectedChannel更新以及將txtGain值變得更新，這反過來又更新selectedindex但它不會發生。
基本上我希望根據我在cmbSignals中選擇的內容更新我的txtGain值。顯然，綁定在那裏，所以我可以修改文本框中的值，並在綁定的屬性中更新它。
我懷疑我必須以某種方式強制更新綁定，但不知道如何做到這一點。任何幫助，將不勝感激。
public partial class MainForm : Form
{
private MyData req;
public MainForm()
{
InitializeComponent();
cmbSignals.DisplayMember = "Name";
cmbSignals.ValueMember = "Value";
}
private void openJSONRequestFileToolStripMenuItem_Click(object sender, EventArgs e)
{
string text = File.ReadAllText("sample.json");
req = new MyData(JsonConvert.DeserializeObject<SerializedRequest>(text));
cmbSignals.DataSource = req.SignalNames;
cmbSignals.SelectedValue = req.SelectedChannel;
SetBindings();
}
private void SetBindings()
{
txtGain.DataBindings.Add(new Binding("Text", req, "Gain"));
}
private void cmbSignals_SelectedValueChanged(object sender, EventArgs e)
{
req.SelectedChannel = Convert.ToInt32(cmbSignals.SelectedValue);
}
}
public class MyData : INotifyPropertyChanged
{
private SerializedRequest Data = new SerializedRequest();
private int selectedIndex = 0;
public int SelectedChannel
{
get
{
return selectedIndex + 1;
}
set
{
this.selectedIndex = value - 1;
}
}
public string Gain
{
get
{
return Data.signals[selectedIndex].gain;
}
set
{
Data.signals[selectedIndex].gain = value;
OnPropertyChanged("Gain");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
public List<SignalsCmbItem>SignalNames
{
get
{
List<SignalsCmbItem>channels = new List<SignalsCmbItem>();
for(int i = 0; i<Data.signals.Count;i++)
{
channels.Add(new SignalsCmbItem { Value = i + 1, Name = i+1 + " - " + Data.signals[i].label });
}
return channels;
}
}
}