如何使用JSon api将图像上传到wordpress(how to upload image to wordpress using JSon api)

 假设frontpage.aspx是一个内容页面，您绝对可以从中访问母版页面。 
 
 例如，此代码将找到母版页上的TextBox和Label控件。 您应该能够调整它以找到您的TreeView： 
 
// Gets a reference to a TextBox control inside a ContentPlaceHolder
ContentPlaceHolder mpContentPlaceHolder;
TextBox mpTextBox;
mpContentPlaceHolder = 
    (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
if(mpContentPlaceHolder != null)
{
    mpTextBox = (TextBox) mpContentPlaceHolder.FindControl("TextBox1");
    if(mpTextBox != null)
    {
        mpTextBox.Text = "TextBox found!";
    }
}

// Gets a reference to a Label control that is not in a 
// ContentPlaceHolder control
Label mpLabel = (Label) Master.FindControl("masterPageLabel");
if(mpLabel != null)
{
    Label1.Text = "Master page label = " + mpLabel.Text;
}
 
 有关详细信息，请参阅 - http://msdn.microsoft.com/en-us/library/c8y19k6h.aspx 

Assuming that frontpage.aspx is a content page you can definitely access the master page from it.
 
For example this code will find a TextBox and Label controls that are on the master page. You should be able to adapt it to find your TreeView:
 
// Gets a reference to a TextBox control inside a ContentPlaceHolder
ContentPlaceHolder mpContentPlaceHolder;
TextBox mpTextBox;
mpContentPlaceHolder = 
    (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
if(mpContentPlaceHolder != null)
{
    mpTextBox = (TextBox) mpContentPlaceHolder.FindControl("TextBox1");
    if(mpTextBox != null)
    {
        mpTextBox.Text = "TextBox found!";
    }
}

// Gets a reference to a Label control that is not in a 
// ContentPlaceHolder control
Label mpLabel = (Label) Master.FindControl("masterPageLabel");
if(mpLabel != null)
{
    Label1.Text = "Master page label = " + mpLabel.Text;
}
 
For more info see - http://msdn.microsoft.com/en-us/library/c8y19k6h.aspx