当 source 是 IQueryable 对象时访问 bindingsource.Current 的内容

发布于 2024-10-09 14:49:52 字数 1345 浏览 1 评论 0原文

目前，我的存储库返回一个 IQueryable 对象，该对象列出了我的数据库中的数据，并将其绑定到 BindingSource 以在网格中使用：

public void BindTo(IQueryable elements)
{
    BindingSource source = new BindingSource();
    source.CurrentChanged += new EventHandler(source_CurrentChanged);
    source.DataSource = elements;

    elementNavigator.BindingSource = source;
    elementGridView.DataSource = source;
}

这非常有用。然而，当用户单击网格中的一行时，我想做一些事情。我正在努力识别用户正在选择的元素。我有以下内容：

在我看来：

private void source_CurrentChanged(object sender, EventArgs e)
{
    _presenter.ElementChanged(sender, e);
}

在我的演示者中：

public void ElementChanged(object sender, EventArgs e)
{
    BindingSource source = (BindingSource)sender;
    // Here I need to get the ID of the selected element in the source.Current property.
    // HOW?
}

这似乎工作正常 - 我可以在调试时看到 source.Current 包含数据：

? source.Current
{ BodyId = 1, IsInUse = true, IsValid = true, CreateDate = {04/07/2006 09:31:59}, LastUpdateDate = {04/07/2006 09:31:59}, StatusDescShort = "Exist" ... }
BodyId: 1
CreateDate: {04/07/2006 09:31:59}
IsInUse: true
IsValid: true
LastUpdateDate: {04/07/2006 09:31:59}
StatusDescShort: "Exist"

但我不知所措访问 BodyId 的值。我有一种感觉，我在这里错过了一些非常明显的东西（不是第一次）。

原文

Currently my repository returns an IQueryable object that lists the data from my DB and I bind this to a BindingSource for use in a grid:

public void BindTo(IQueryable elements)
{
    BindingSource source = new BindingSource();
    source.CurrentChanged += new EventHandler(source_CurrentChanged);
    source.DataSource = elements;

    elementNavigator.BindingSource = source;
    elementGridView.DataSource = source;
}

This works great. However I am wanting to do some stuff when a user clicks an row in the grid. I'm struggling to identify the element that the user is selecting. I have the following:

In my view:

private void source_CurrentChanged(object sender, EventArgs e)
{
    _presenter.ElementChanged(sender, e);
}

In my presenter:

public void ElementChanged(object sender, EventArgs e)
{
    BindingSource source = (BindingSource)sender;
    // Here I need to get the ID of the selected element in the source.Current property.
    // HOW?
}

This seems to work ok - and I can see when debugging that source.Current contains the data:

? source.Current
{ BodyId = 1, IsInUse = true, IsValid = true, CreateDate = {04/07/2006 09:31:59}, LastUpdateDate = {04/07/2006 09:31:59}, StatusDescShort = "Exist" ... }
BodyId: 1
CreateDate: {04/07/2006 09:31:59}
IsInUse: true
IsValid: true
LastUpdateDate: {04/07/2006 09:31:59}
StatusDescShort: "Exist"

but I am at a loss as how I might access the value of BodyId. I've a feeling I'm missing something really obvious here (not the first time).

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