[英]Image property not found in runtime PictureBox control c#
从item变量中找不到图像属性。 我的代码是-
foreach (Control item in this.Controls) //Iterating all controls on form
{
if (item is PictureBox)
{
if (item.Tag.ToString() == ipAddress + "OnOff")
{
MethodInvoker action = delegate
{ item.Image= }; //.Image property not shown
item.BeginInvoke(action);
break;
}
}
}
有什么帮助吗?
您的item
变量仍然是Control
类型。 检查它所引用的实例是否为PictureBox
不会改变它。 您可以将代码更改为:
foreach (Control item in this.Controls) //Iterating all controls on form
{
var pb = item as PictureBox; // now you can access it a PictureBox, if it is one
if (pb != null)
{
if (item.Tag.ToString() == ipAddress + "OnOff")
{
MethodInvoker action = delegate
{
pb.Image = ... // works now
};
bp.BeginInvoke(action);
break;
}
}
}
使用as
运算符,如下所示:
foreach (Control item in this.Controls)
{
PictureBox pictureBox = item as PictureBox;
if (pictureBox != null)
{
if (item.Tag.ToString() == ipAddress + "OnOff")
{
MethodInvoker action = delegate
{ item.Image= ... };
item.BeginInvoke(action);
break;
}
}
}
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