asp.net StringBuilder的用法实例代码

2024-07-10 12:53:43

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string对象在进行字符串缝合时，由于字符串的不变性，每次都会对字符串对象进行缝合，将复制一份进行操作，而自己的字符串仍在内存中，大量的临时片段会导致性能损失，这是不可忽视的，下面就让错新技术频道小编带你学习asp.net StringBuilder的用法实例代码。

要实现上述效果

复制代码代码如下:

public static string ShowNewMsg()
{
string Pic1 = "images/yzdp-_15.gif";
string Pic2 = "images/yzdp-_18.gif";
string Pic3 = "images/yzdp-_20.gif";
string Pic4 = "images/yzdp-_22.gif";
string Pic5 = "images/yzdp-_24.gif";
string Pic6 = "images/yzdp-_26.gif";
string Pic7 = "images/yzdp-_28.gif";
string Pic8 = "images/yzdp-_30.gif";
string Pic9 = "images/yzdp-_32.gif";
string Pic10 = "images/yzdp-_34.gif";
BJMsgInfo Info = new BJMsgInfo();
Info.Version = "cn";
Info.IsNew = true;
DataTable dt = WebManager.List(Info, "BJUserInfoMsg", "top 10 UserID,Title,UserTitle,UserType,yzfd,CompanyName,yzpl,yzfw,yzzl,UserPic,Comments,CreateTime,MsgInfo,Category", "&isnew", "[OrderNo]");
StringBuilder Builder = new StringBuilder();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Builder.Append("<table width='100%' border='0' cellspacing='0' cellpadding=0'> <tr>");
Builder.Append("<td width='6%' align='left' valign='middle'>");
Builder.Append("<img ");
if (i == 0)
{
Builder.AppendFormat("src='{0}'", Pic1);
}
else if (i == 1)
{
Builder.AppendFormat("src='{0}'", Pic2);
}
else if (i == 2)
{
Builder.AppendFormat("src='{0}'", Pic3);
}
else if (i == 3)
{
Builder.AppendFormat("src='{0}'", Pic4);
}
else if (i == 4)
{
Builder.AppendFormat("src='{0}'", Pic5);
}
else if (i == 5)
{
Builder.AppendFormat("src='{0}'", Pic6);
}
else if (i == 6)
{
Builder.AppendFormat("src='{0}'", Pic7);
}
else if (i == 7)
{
Builder.AppendFormat("src='{0}'", Pic8);
}
else if (i == 8)
{
Builder.AppendFormat("src='{0}'", Pic9);
}
else if (i == 9)
{
Builder.AppendFormat("src='{0}'", Pic10);
}
Builder.Append(" width='15' height='12' />");
Builder.Append("</td><td width='94%' align='left' valign='middle'>");
//<a href="qbdp.aspx?CompanyName=<%#Eval(" href="qbdp.aspx?CompanyName=<%#Eval("CompanyName") %>"><%#Eval("CompanyName")%></a>
Builder.Append(" <a href=");
Builder.Append(" href=");
Builder.Append("qbdp.aspx?");

Builder.AppendFormat("CompanyName='{0}'", dt.Rows[i][5].ToString());

Builder.Append("</a>");
Builder.AppendFormat("     {0}", dt.Rows[i][5].ToString());
Builder.Append("</td></tr></table>");
}

}
return Builder.ToString();
//DLNewMsgInfo.DataSource = dt.DefaultView;
//DLNewMsgInfo.DataBind();
}