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 = "
     
      " + body + "
     
     
";

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);}