Question

在我的aspx页面上有一个按钮。我想动态更改其属性。

例如： ID为Button1的按钮，我想将其属性Visible更改为false。在代码背后有三个变量hidefield = "Button1"，property = "Visible"和value = false。是否可以使用变量设置属性Visible？

ASPX：

<asp:Button ID="Button1" runat="server" Text="Button1" />

代码背后的代码：

protected void Page_Load(object sender, EventArgs e)
{
    string hidefield = "Button1";
    string property = "Visible";
    bool value = false;
    if (!IsPostBack)
    {
        Control myControl1 = FindControl(hidefield);
        if (myControl1 != null)
        {
            myControl1.property = value; // <- I know this statement has error. Is there any way to set the property like this?
        }
    }
}

Answer 1

使用反射，基于Set object property using reflection

using System.Reflection;

protected void Page_Load(object sender, EventArgs e)
{
    string hidefield = "Button1";
    string property = "Visible";
    bool value = false;
    if (!IsPostBack)
    {
        Control myControl1 = FindControl(hidefield);
        if (myControl1 != null)
        {
            myControl.GetType().InvokeMember(hidefield ,
               BindingFlags.Instance | BindingFlags.Public | BindingFlags.SetProperty,
               Type.DefaultBinder, myControl, value);
        }
    }
}

它非常混乱，并且不具备人类可读性，因此可能存在可维护性问题。

Answer 2

怎么样：

Button myControl1 = FindControl(hidefield) as Button;

 if (myControl1 != null)
 {
    myControl1.Visible= value; 
 }

Answer 3

protected void Page_Load(object sender, EventArgs e)
{
    string hidefield = "Button1";
    string property = "Visible";
    bool value = false;
    if (!IsPostBack)
    {
       /* Use below two lines if you are using Master Page else you wouldnot be able to access your control */

        ContentPlaceHolder MainContent = Page.Master.FindControl("MainContent") as ContentPlaceHolder;
        Control myControl1 = MainContent.FindControl(hidefield);

        if (myControl1 != null)
        {
             myControl1.GetType().GetProperty(property).SetValue(myControl1,value,null);  
        }
    }
}

ASP NET：是否可以动态设置控件属性？

3 个答案: