c# - 如何从按钮单击调用 Gridview 单元格单击事件

Question

我有一个按钮，我必须在该按钮上调用 Gridview 的事件，任何人都可以帮助我如何实现此功能。我的代码在下面 可以做什么？

DataGridViewTextBoxColumn col1 = new DataGridViewTextBoxColumn();
DataGridViewTextBoxColumn col2 = new DataGridViewTextBoxColumn();
DataGridViewTextBoxColumn col3 = new DataGridViewTextBoxColumn();
col1.HeaderText = "Variance";
col2.HeaderText = "Tolerance";
col3.HeaderText = "Flags";

if (e.ColumnIndex == 5 || e.ColumnIndex == 6)
{
    double  ActualWeight;
    double TargetWeight;

    object val1 = dataGridView2.Rows[e.RowIndex].Cells[5].Value;
    object val2 = dataGridView2.Rows[e.RowIndex].Cells[6].Value;

    if (val1 != null && val2 != null
      && double.TryParse(val1.ToString(), out ActualWeight)
      && double.TryParse(val2.ToString(), out TargetWeight))
    {
        dataGridView2.Rows[e.RowIndex].Cells[0].Value =Math.Round (ActualWeight-TargetWeight);
    }
    else
    {
        dataGridView2.Rows[e.RowIndex].Cells[0].Value =         "Invalid Numbers";
    }       
}


protected void bUpdate_Click(object sender, EventArgs e)
{
   // I have to call Gridview Event here
}

Answer 1

您不能引发其他类事件。事件实际上是作为私有(private)委托(delegate)编写的。但您可以通过反射或控制继承来实现。

在控件继承中，您必须首先从您的目标控件 (DataGridView) 继承，因此定义一个方法来调用您需要运行它的事件。

换句话说，您只需找到私有(private)委托(delegate)字段，获取它，然后调用它:

public static void Raise<TEventArgs>(this object source, string eventName, TEventArgs eventArgs) where TEventArgs : EventArgs
    {
        var eventDelegate = (MulticastDelegate)source.GetType().GetField(eventName, BindingFlags.Instance | BindingFlags.NonPublic).GetValue(source);
        if (eventDelegate != null)
        {
            foreach (var handler in eventDelegate.GetInvocationList())
            {
                handler.Method.Invoke(handler.Target, new object[] { source, eventArgs });
            }
        }
    }

引用资料:

The following code example shows how to load an assembly, create an instance of a type from the assembly, create an event handler using a dynamic assembly, and hook up the dynamic event handler. All actions are performed using late binding.

How to: Hook Up a Delegate Using Reflection

How do I raise an event via reflection in .NET/C#?