c# - 使用 DataBinding 更新标签

Question

在我的余额标签最初绑定(bind)到一个数字后，再次更改数据源不会再次更新该值。

我想在数据库对象更改后自动更新 Windows 窗体标签，并将其重新拉入 constructorData.BankAccount。

public class ConstructorData
{
    public Client Client { get; set; }
    public BankAccount BankAccount { get; set; }
}

private void frmTransaction_Load(object sender, EventArgs e)
{
    // Pretend we populated constructor data already

    // This line of code is working
    bankAccountBindingSource.DataSource = constructorData.BankAccount;
}

private void lnkProcess_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
    constructorData.BankAccount = db.BankAccounts.Where(x => x.BankAccountId == constructorData.BankAccount.BankAccountId).SingleOrDefault();

    // What do I do here

    // Doesn't work
    bankAccountBindingSource.EndEdit();
    bankAccountBindingSource.ResetBindings(false);
}

自动生成代码:

// 
// lblAccountBalance
// 
this.lblAccountBalance.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.lblAccountBalance.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.bankAccountBindingSource, "Balance", true));
this.lblAccountBalance.Location = new System.Drawing.Point(482, 71);
this.lblAccountBalance.Name = "lblAccountBalance";
this.lblAccountBalance.Size = new System.Drawing.Size(196, 23);
this.lblAccountBalance.TabIndex = 7;
this.lblAccountBalance.Text = "label1";

Answer 1

从这里开始(在表单加载内):

bankAccountBindingSource.DataSource = constructorData.BankAccount;

您直接绑定(bind)到 BankAccount 实例，甚至实现INotifyPropertyChanged在ConstructorData类(如评论中所建议的)将无济于事。

使用该设计，您可以随时分配一个新的 BankAccount实例到 ConstructorData.BankAccount属性(如代码所示)，您还需要将其设置为 DataSource的 BindingSource使用:

constructorData.BankAccount = db.BankAccounts.Where(x => x.BankAccountId == constructorData.BankAccount.BankAccountId).SingleOrDefault();
// What do I do here
bankAccountBindingSource.DataSource = constructorData.BankAccount;