C# winforms 数据绑定文本框到 wcf 请求

Question

I'm currently trying to parse a request from my Customer-Class into a winform. I am getting the content through a WCF service i've built.

Here is the Form1 code:

    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btn_search_Click(object sender, EventArgs e)
    {
        Dictionary<string, string> dict = new Dictionary<string, string>();  
        int valueParsed;
        if(txt_KNr.TextLength == 6)
        {
            if(Int32.TryParse(txt_KNr.Text.Trim(), out valueParsed))
            {
                Service svc = new Service();
                WcfServiceGVO.CustomerData data = svc.Connect(txt_KNr.Text);
                dict = svc.SplitData(data);
                txt_FirstName.DataBindings.Add("Text", data, "FirstName", false, DataSourceUpdateMode.OnPropertyChanged);
                txt_LastName.DataBindings.Add("Text", data, "LastName");
                txt_Street.DataBindings.Add("Text", data, "Street");
                txt_PLZ.DataBindings.Add("Text", data, "PLZ");
                txt_Location.DataBindings.Add("Text", data, "Location");
                lbl_ampErg.DataBindings.Add("Text", data, "Ampel");
            }}

Here is part of the Reference.cs

        public string LastName {
        get {
            return this.LastNameField;
        }
        set {
            if ((object.ReferenceEquals(this.LastNameField, value) != true)) {
                this.LastNameField = value;
                this.RaisePropertyChanged("LastName");
            }
        }
    }

It works the first time, but the second time the compiler says there are 2 bindings (so i guess my DataBindings shouldn't be in the button_Click but under InitializeComponent();) If i do that, the code runs but won't update the textboxes. What do i need to change, so that the textboxes get updated as soon as my request gets the data from the server? If the property is changed, it should update the interface.

Answer 1

Option 1 - Quick Fix

A quick fix would be clearing DataBindings collection before adding a new Binding .

Option 2 - Using BindingSource in Code

You can create a BindingSource in code and set type of your model as it's DataSource , then perform data binding to the BindingSource in code. Then when loading data, just assign data to DataSource property of the binding source. For example:

private BindingSource bindingSource1 = new BindingSource();
private void Form1_Load(object sender, EventArgs e)
{
    bindingSource1.DataSource = typeof(Model1);
    this.textBox1.DataBindings.Add("Text", bindingSource1, "Property1", true,
                                    DataSourceUpdateMode.OnValidation);
    this.textBox2.DataBindings.Add("Text", bindingSource1, "Property2", true,  
                                    DataSourceUpdateMode.OnValidation);
}

private void button1_Click(object sender, EventArgs e)
{
    bindingSource1.DataSource = GetData();
}

Option 3 - Designer Support

You can use a BindingSource component for data binding at design-time. You can put a BindingSource component on your form and set it's data source property at design-time to the desired type. Then you will have design-time support for data binding using designer. You can bind your text boxes and labels to that binding source. Then when loading data, it's enough to assign data to DataSource property of BindingSource .

More Information:

• Add new data sources specially this partData sources for services
• How to: Bind Data Returned by a Service

Answer 2

The Problem i had was to understand that i could drag and drop the textboxes into the UI and how to actually do stuff with it. Now it seems to be working because i've added the following code to my previous:

   private void btn_search_Click(object sender, EventArgs e)
    {
        Dictionary<string, string> dict = new Dictionary<string, string>();  
        int valueParsed;
        if(txt_KNr.TextLength == 6)
        {
            if(Int32.TryParse(txt_KNr.Text.Trim(), out valueParsed))
            {
                Service svc = new Service();
                WcfServiceGVO.CustomerData data = svc.Connect(txt_KNr.Text);
                customerDataBindingSource.DataSource = data;
                //txt_FirstName.DataBindings.Add("Text", data, "FirstName");
                //txt_LastName.DataBindings.Add("Text", data, "LastName");
                //txt_Street.DataBindings.Add("Text", data, "Street");
                //txt_PLZ.DataBindings.Add("Text", data, "PLZ");
                //txt_Location.DataBindings.Add("Text", data, "Location");
                //lbl_ampErg.DataBindings.Add("Text", data, "Ampel");                    
            }   
}

the key was to understand that i could just use my servicedata as a DataSource! Thanks Reza for the great help!