动态添加DevExpress ReportViewer 的 Style

最新推荐文章于 2021-11-05 18:44:10 发布

转载最新推荐文章于 2021-11-05 18:44:10 发布 · 131 阅读

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原文链接：http://www.cnblogs.com/1-2-3/articles/1237269.html

在DevExpress的ReportViewer与RadGrid结合使用时，通过RadAjaxManager进行异步刷新会导致ReportViewer样式丢失。本文介绍了一种解决方案，即在Page_Load中通过ExportToHtml方法获取并保留样式。

这个DevExpress的ReportViewer折磨死我了。

把它和RadGrid等控件放在同一个页面上，用RadAjaxManager控制它们进行异步刷新。结果发现异步刷新了某个控件之后，那个DevExpress的ReportViewer的样式就全都显示不出来了（字体、颜色甚至表格线都看不到了）。查看页面源文件，发现这个ReportViewer会把自己输出成一个Div，然后再在后面追加输出一堆Style：

Style

.cs6591E277 {

}{color:#000000;background-color:#FFFFFF;border-left:#000000 1px solid;border-top:#000000 1px solid;border-right:#000000 1px solid;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:bold; font-style:normal; padding-left:2px;padding-right:2px;}

.csD3080846 {

}{color:#000000;background-color:#FFFFFF;border-left:#000000 1px solid;border-top-style: none;border-right:#000000 1px solid;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; padding-left:2px;padding-right:2px;}

.cs73023F8C {

}{color:#000000;background-color:#FFFFFF;border-left-style: none;border-top:#000000 1px solid;border-right:#000000 1px solid;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:bold; font-style:normal; padding-left:2px;padding-right:2px;}

.csBFB73F4C {

}{color:#000000;background-color:#FFFFFF;border-left-style: none;border-top-style: none;border-right:#000000 1px solid;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; padding-left:2px;padding-right:2px;}

.csD7D3D909 {

}{color:#000000;background-color:transparent;border-left:#000000 1px solid;border-top-style: none;border-right-style: none;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.cs9195D68E {

}{color:#000000;background-color:transparent;border-left:#000000 1px solid;border-top-style: none;border-right-style: none;border-bottom-style: none;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.cs119DE757 {

}{color:#000000;background-color:transparent;border-left-style: none;border-top-style: none;border-right:#000000 1px solid;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.cs29BC36A1 {

}{color:#000000;background-color:transparent;border-left-style: none;border-top-style: none;border-right:#000000 1px solid;border-bottom-style: none;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.cs7FE4C565 {

}{color:#000000;background-color:transparent;border-left-style: none;border-top-style: none;border-right-style: none;border-bottom:#000000 1px solid;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.csB44DACD1 {

}{color:#000000;background-color:transparent;border-left-style: none;border-top-style: none;border-right-style: none;border-bottom-style: none;font-family:楷体_gb2312; font-size:9pt; font-weight:normal; font-style:normal; }

.cs8ADCFAE6 {

}{color:#008080;background-color:#FFFFFF;border-left-style: none;border-top-style: none;border-right-style: none;border-bottom-style: none;font-family:楷体_gb2312; font-size:24pt; font-weight:bold; font-style:normal; padding-left:2px;padding-right:2px;}

.csF7D3565D {

}{height:0px;width:0px;overflow:hidden;font-size:0px;line-height:0px;}

</style>

估计是异步刷新之后这些Style没被认出来。解决方法是在Page_Load里调用Report的ExportToHtml()方法获取它的全部HTML，然后使用正则表达式截取Style那部分，然后使用Page.ClientScript.RegisterClientScriptBlock()把这些Style注册先。

RegisterReportStyle

private void RegisterReportStyle(int ReportCode)

{

string key = string.Format("Report{0}Style", ReportCode);

if (ViewState[key] == null || string.IsNullOrEmpty(ViewState[key].ToString()))

{

// 创建报表对象

IReportTemplateHistoryManager rptHisMgr = ContainerHelper.CreateInstanceByContainer<IReportTemplateHistoryManager>();

ReportTemplateHistoryEntity rptHisEntity = rptHisMgr.GetCurrentReportTemplateHistory(ReportCode);

MemoryStream ms = new MemoryStream(rptHisEntity.ReportContent);

XtraReport rpt = XtraReport.FromStream(ms, true);

//获取报表Style

MemoryStream mStream = new MemoryStream();

rpt.ExportToHtml(mStream);

StreamReader sReader = new StreamReader(mStream);

mStream.Position = 0;

string htmlText = sReader.ReadToEnd();

Regex regex = new Regex("<style type=\"text/css\">.*</style>", RegexOptions.Singleline);

Match matchStyleHtml = regex.Match(htmlText);

ViewState[key] = matchStyleHtml.Value;

}

//向页面输出报表Style

if (Page.ClientScript.IsClientScriptBlockRegistered(typeof(Page), key) == false)

{

string sss = ViewState[key].ToString();

Page.ClientScript.RegisterClientScriptBlock(typeof(Page), key, ViewState[key].ToString());

}

转载于:https://www.cnblogs.com/1-2-3/articles/1237269.html