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Using themed css files requires a header control on the page. (e.g. <head runat=“server” />)

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没有蜡笔的小新
没有蜡笔的小新 2021-02-12 15:24

I\'m working on asp.net web project. When I run the project, It works correctly. But In server, I got the following error. How to solve this problem?

Using theme
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  • 陌清茗
    陌清茗 (楼主)
    2021-02-12 16:11

    I have tried all the suggested things with out finding a solution.

    I am just needing a dummy page placeholder for calling LoadControl with a UserControl. I tried setting Theme and StyleSheetTheme multiple places because System.Web.UI.Page has this OnInit method:

    protected internal override void OnInit(EventArgs e) { 
    base.OnInit(e);

    if (_theme != null) { 
        _theme.SetStyleSheet();
    } 

    if (_styleSheet != null) {
        _styleSheet.SetStyleSheet();
    } 
}

    I tried setting the values in OnPreInit and OnInit but that resulted in exceptions saying that I is not allowed to set those properties there. So I tried this code and found that I Theme and StyleSheetTheme where set in OnInit but not OnPreInit:

    public BaseRenderingPage()
{
    EnableTheming = false;
    Theme = null;
    StyleSheetTheme = null;
}

protected override void OnPreInit(EventArgs e)
{
    if (EnableTheming || Theme != null || StyleSheetTheme != null)
        throw new Exception("OnPreInit: " + EnableTheming + ", " + Theme + ", " + StyleSheetTheme);
    base.OnPreInit(e);
}   

protected override void OnInit(EventArgs e)
{
    if (EnableTheming || Theme != null || StyleSheetTheme != null)
        throw new Exception("OnInit: " + EnableTheming + ", " + Theme + ", " + StyleSheetTheme);
    base.OnInit(e);
}

    I ended solving it with this hack:

    public override string Theme
{
    get { return null; }
    set { base.Theme = null; }
}

public override string StyleSheetTheme
{
    get { return null; }
    set { base.StyleSheetTheme = null; }
}

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