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今天在写下面的代码时遭遇错误——“System.Web.UI.WebControls.Literal”不允许使用子控件(‘System.Web.UI.WebControls.Literal‘ does not allow child controls):
var postBodyDiv = new HtmlGenericControl() { ID = "cnblogs_post_body", ClientIDMode = ClientIDMode.Static, TagName = "div", InnerHtml = body }; var signatureDiv = new HtmlGenericControl() { ID = "signature", TagName = "div" }; literalBody.Controls.Add(postBodyDiv); literalBody.Controls.Add(signatureDiv);
literalBody的类型是System.Web.UI.WebControls.Literal。将postBodyDiv与signatureDiv作为子控件添加到literalBody中,是为了避免字符串拼接带来的内存消耗。
之前字符串拼接的代码如下:
literalBody.Text = "<div id=\"cnblogs_post_body\">" + body + "</div><div id=\"signature\"></div>";
本来这不是问题,把类型由Literal改为Label就行了,但是实际场景不允许这么做,必须要用Literal。
后来采取了在literalBody的父控件中动态添加postBodyDiv与signatureDiv的方法解决了问题,代码如下:
var postBodyDiv = new HtmlGenericControl() { ID = "cnblogs_post_body", ClientIDMode = ClientIDMode.Static, TagName = "div", InnerHtml = body }; var signatureDiv = new HtmlGenericControl() { ID = "signature", TagName = "div" }; var bodyControlIndex = this.Controls.IndexOf(literalBody); if (bodyControlIndex >= 0) { Controls.AddAt(bodyControlIndex, postBodyDiv); Controls.AddAt(bodyControlIndex + 1, signatureDiv); }
“System.Web.UI.WebControls.Literal”不允许使用子控件
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原文地址:http://www.cnblogs.com/dudu/p/literal-does-not-allow-child-controls.html