System.Reflection.PropertyInfo.SetValue()调用按钮的默认事件处理程序

时间:2008-11-21 18:31:59

标签: winforms reflection c#-2.0

所以我不确定为什么会这样,但我正在运行一些DataRows,其中我有我想要设置的控件名称,属性和值。一切正常,除非我设置按钮的TEXT属性。出于某种原因,点击事件被称为......

以下是我得到的一些代码:

string controlName, value, property;
Control currentControl = null;
System.Reflection.PropertyInfo propertyInfo = null;

// run through all rows in the table and set the property
foreach (DataRow r in languageDataset.Tables[_parentForm.Name].Rows)
{
  controlName = r["ControlName"].ToString().ToUpper();
  value = r["Value"].ToString();
  property = r["Property"].ToString();

  // check all controls on the form
  foreach (Control c in formControls)
  {
    // only change it if its the right control
    if (c.Name.ToUpper() == controlName)
    {
      propertyInfo = c.GetType().GetProperty(property);

      if (propertyInfo != null)
        propertyInfo.SetValue(c, value, null);  ******Calls Event Handler?!?!******
      //

      currentControl = c;
      break;
    }
  }
}

那么为什么世界上它会在设置值时调用事件处理程序?以下是我设置它的原因:

<SnappletChangePassword>  
  <ControlName>buttonAcceptPassword</ControlName>
  <Property>Text</Property>  
  <Value>Accept</Value>
</SnappletChangePassword>

2 个答案:

答案 0 :(得分:3)

我无法通过简单但完整的简短程序重现这一点:

using System;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

class Test
{
    static void Main()
    {
        Button goButton = new Button { 
            Text = "Go!",
            Location = new Point(5, 5)
        };

        Button targetButton = new Button {
            Text = "Target",
            Location = new Point(5, 50)
        };
        goButton.Click += (sender, args) => SetProperty(targetButton, "Text", "Changed");
        targetButton.Click += (sender, args) => MessageBox.Show("Target clicked!");

        Form f = new Form { Width = 200, Height = 120,
                Controls = { goButton, targetButton }
        };
        Application.Run(f);
    }

    private static void SetProperty(object target, string propertyName, object value)
    {
        PropertyInfo property = target.GetType().GetProperty(propertyName);
        property.SetValue(target, value, null);
    }
}

你能想出一个演示的同样完整的程序吗?

答案 1 :(得分:0)

可悲的是,不,我也无法复制它。我不确定是什么导致它,但我所做的就是删除按钮然后把它放回去。

不确定它是什么,但感谢代码。

你没有在.Net2.0中写过这个吗?