Question

我有两种形式“都开放”。我想从表单1（已经打开）向表单2（已经打开）发送一个datagridview单元格值。（我不想在加载表单时传递文本，而是在已经打开的表单上进行一些编辑之后）。我已经在网上搜索了几天，但是找不到已经打开的表单。（仅包含form.Show()属性的文件。）

Answer 1

您可以创建一个共享的单例类以保留您的数据

/// <summary>
/// A singleton class to keep your application data
/// </summary>
public class MySharedData
{
    /// <summary>
    /// Called when data changes
    /// </summary>
    public event EventHandler DataChanged;
    private static MySharedData _instance;
    private object _data;

    public static MySharedData Instance => _instance ?? (_instance = new MySharedData());

    private MySharedData()
    {
    }

    /// <summary>
    /// Gets or sets the data you want to share
    /// </summary>
    public object Data
    {
        get => _data;
        set
        {
            _data = value;
            OnDataChanged();
        }
    }

    protected virtual void OnDataChanged()
    {
        DataChanged?.Invoke(this, EventArgs.Empty);
    }
}

使用事件通知che数据已更新。

然后在表单中订阅该事件并添加您的更新逻辑

    public class YourForm : Form
    {
        public YourForm()
        {
            MySharedData.Instance.DataChanged += Instance_DataChanged;
        }

        private void Instance_DataChanged(object sender, EventArgs e)
        {
            // TODO: redraw your form
        }
    }

当“两个表单都打开”时，如何将文本从form1传递到form2

1 个答案: