Angular HttpClient和服务(Angular HttpClient and Services)

 <%= expressions不能用作属性，您必须改用<%# expressions 。 
 
 由于<%# expressions是在DataBind()时间计算的，所以如果使用它，则需要调用DataBind(); 方法在PreRenderComplete类似.. 
 
protected void Page_PreRenderComplete(object sender, EventArgs e)
{
    DataBind();
}
 
 最后它会是，如果你将属性设置为你的标签控件 
 
Text='<%# DealCollector.Model.SiteDetails.HtmlMetaKeyword %>'

<%= expressions cannot be used as properties, you have to use <%# expressions instead.
 
Since <%# expressions are evaluated at DataBind() time, if you used that, then you need to call DataBind(); method at PreRenderComplete like..
 
protected void Page_PreRenderComplete(object sender, EventArgs e)
{
    DataBind();
}
 
Finally it will be like, if you set the property to your label control
 
Text='<%# DealCollector.Model.SiteDetails.HtmlMetaKeyword %>'