用反射简化 asp.net 报表的一点总结
有几个报表, 查询条件都一样，仅仅里面GridView中有几个列区别，以前图快，就把原来Report.aspx文件拷贝一份，改名为Report1.aspx，然后，修改里面的column，然后再由后台库查出数据，填充到这个report中来。
今天终于不耐烦了，这个方法确实太笨了，改一改，方案如下：
1.创建一个IReport的接口，所有的report都实现这个接口。
public interface IReport
{
// 该report所有可用列集合(每一次查询不一定全部显示)
Dictionary<string, string> DictColMapping { get; }
// (本次查询)该report显示的列KeyField和HeaderText集合
Dictionary<string, int> DictColIndexMapping { get; }
/// (本次查询)该report显示的列SortExpressField和所在位置Index集合
List<ReportColumn> ReportColumnCollection { get; }
// 导出excel的文件名
string ToExcelName { get; }
// 该report的唯一编号，用于安全验证
string ReportResourceID { get; }
// 产生report，输入条件为一个参数数组
DataSet ProccessReport(params object[] ParamList);
}
2.创建一个ReportColumn类。
public class ReportColumn
{
public string ColumnDataField { set; get; }
public string ColumnHeaderText { set; get; }
public string ColumnSortExpression { set; get; }
public int ColumnIndex { set; get; }
public ReportColumn(string _ColumnDataField, string _ColumnHeaderText, string _ColumnSortExpression, int _ColumnIndex)
{
this.ColumnDataField = _ColumnDataField;
this.ColumnHeaderText = _ColumnHeaderText;
this.ColumnSortExpression = _ColumnSortExpression;
this.ColumnIndex = _ColumnIndex;
}
}
3.创建报表的抽象基类，里面放些处理类似报表的通用方法。
public abstract class clsReportBase
{}
4.创建实际的报表类
public class clsReport_SalesOrder : clsReportBase, IReport
{
private List<ReportColumn> _ReportColumnCollection; //该report所有可用列集合(每一次查询不一定全部显示)
private Dictionary<string, string> _DictColMapping; //(本次查询)该report显示的列KeyField和HeaderText集合
private Dictionary<string, int> _DictColIndexMapping; //(本次查询)该report显示的列SortExpressField和所在位置Index集合
public clsReport_SalesOrder()
{
_ReportColumnCollection = new List<ReportColumn>();
_DictColMapping = new Dictionary<string, string>();
_DictColIndexMapping = new Dictionary<string, int>();
FillReportColumnCollection();
}
/// <summary>
/// 填充该report所有可用列集合
/// </summary>
private void FillReportColumnCollection()
{
AddColumnToCollection(new ReportColumn("Province", "省", "省", 0));
AddColumnToCollection(new ReportColumn("Vertical", "行业", "行业", 1));
AddColumnToCollection(new ReportColumn("ProductLine", "产品", "产品", 2));
AddColumnToCollection(new ReportColumn("Subtotal", "订单额($)", "订单额($)", 3));
}
/// <summary>
/// 该report所有可用列集合(每一次查询不一定全部显示)
/// </summary>
public List<ReportColumn> ReportColumnCollection
{
get
{
return _ReportColumnCollection;
}
}
/// <summary>
/// (本次查询)该report显示的列KeyField和HeaderText集合
/// </summary>
public Dictionary<string, string> DictColMapping
{
get
{
return _DictColMapping;
}
}
/// <summary>
/// (本次查询)该report显示的列SortExpressField和所在位置Index集合
/// </summary>
public Dictionary<string, int> DictColIndexMapping
{
get
{
return _DictColIndexMapping;
}
}
/// <summary>
/// (本次查询)该report需要格式化为货币的列集合
/// </summary>
public List<string> MoneyFormatColumnCollection
{
get
{
return _MoneyFormatColumnCollection;
}
}
/// <summary>
/// report名称
/// </summary>
public string ToExcelName
{
get
{
return "订单统计.xls";
}
}
/// <summary>
/// report唯一编码
/// </summary>
public string ReportResourceID
{
get
{
return "12345";
}
}
private void AddColumnToCollection(ReportColumn column)
{
_ReportColumnCollection.Add(column);
_DictColMapping.Add(column.ColumnDataField, column.ColumnHeaderText);
_DictColIndexMapping.Add(column.ColumnSortExpression, column.ColumnIndex);
}
/// <summary>
/// 产生report，输入条件为一个参数数组
/// </summary>
/// <param name="ParamList"></param>
/// <returns></returns>
public DataSet ProccessReport(params object[] ParamList)
{
...从ParamList参数列表里解析出查询条件，然后从数据库取数据。
}
}
5.前台aspx页面里的GridView
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" CellPadding="2" CssClass="autoTable" AllowSorting="false">
<Columns>
</Columns>
</asp:GridView>
6.在前台aspx.cs页面里，通过url传来的报表类名，反射出报表的实例。
protected void Page_Load(object sender, EventArgs e)
{
_InitReport(this.Request.QueryString["Report"]);
}
private void _InitReport(string QueryString)
{
string reportClassName = QueryString;
string reportAssemblyName = "Test";
string reportFullClassName = reportAssemblyName + "." + reportClassName;
report = (IReport)Assembly.Load(reportAssemblyName).CreateInstance(reportFullClassName);
_DictColMapping = new Dictionary<string, string>();
_DictColMapping = report.DictColMapping;
_DictColIndexMapping = new Dictionary<string, int>();
_DictColIndexMapping = report.DictColIndexMapping;
GridView1.Columns.Clear();
foreach (ReportColumn column in report.ReportColumnCollection)
{
BoundField bf = new BoundField();
bf.DataField = column.ColumnDataField;
bf.HeaderText = column.ColumnHeaderText;
bf.SortExpression = column.ColumnSortExpression;
bf.HeaderStyle.Wrap = false;
bf.ItemStyle.Wrap = false;
GridView1.Columns.Add(bf);
}
}
protected void btn_Search_Click(object sender, EventArgs e)
{
object[] arr = new object[] { UserObject, ConditionObject ... };
DataSet m_Data = report.ProccessReport(arr);
HideSomeColumns(m_Data); //如果需要，可以在此屏蔽不显示的列，设置列visiable=false.
this.GridView_SalesOrderSummarization.DataSource = m_Data.Tables[0];
this.GridView_SalesOrderSummarization.DataBind();
}
7.这样, 就只用一个aspx文件文成多个报表了, 只要把类型当作参数传过来即可.
Report.aspx?Report=clsReport_SalesOrder
Report.aspx?Report=clsReport_SalesOrder2
这样就精简了前台aspx的程序数量, 方便了以后系统的维护.