update-check-errors.aspx

来自「东软内部材料（四）asp等相关的教学案例　」· ASPX 代码 · 共 144 行

ASPX
144 行
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<%@Page Language="C#"%>

<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.OleDb" %>

<%@ Register TagPrefix="wrox" TagName="connect" Src="..\global\connect-strings.ascx" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>Validating Edits in a Table with the RowUpdated Event</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Validating Edits in a Table with the RowUpdated Event</span><hr />
<!--------------------------------------------------------------------------->

<%-- insert connection string script --%>
<wrox:connect id="ctlConnectStrings" runat="server"/>

<div>Connection string: <b><span id="outConnect" runat="server"></span></b></div>
<div>SELECT command: <b><span id="outSelect" runat="server"></span></b></div>
<div id="outError" runat="server">&nbsp;</div>

<b>Changed records in the Books table after editing:</b>
<asp:datagrid id="dgrResult" runat="server" /><p />

<div id="outResult" runat="server"></div>

<script language="C#" runat="server">

	void Page_Load(Object sender, EventArgs e)
	{
		// get connection string from ..\global\connect-strings.ascx user control
		string strConnect = ctlConnectStrings.OLEDBConnectionString;
		outConnect.InnerText = strConnect; // and display it

		// specify the SELECT statement to extract the data
		string strSelect = "SELECT * FROM BookList WHERE ISBN LIKE '18610027%'";
		outSelect.InnerText = strSelect;   // and display it

		string strResult  = "" ; // to hold the result

		// create a new DataSet object
		DataSet objDataSet = new DataSet();

		// create a new Connection object using the connection string
		OleDbConnection objConnect = new OleDbConnection(strConnect);

		// create a new DataAdapter using the connection object and select statement
		OleDbDataAdapter objDataAdapter = new OleDbDataAdapter(strSelect, objConnect);

		try
		{
			// fill the dataset with data from the DataAdapter object
			objDataAdapter.Fill(objDataSet, "Books");
		}
		catch (Exception objError)
		{
			// display error details
			outError.InnerHtml = "<b>* Error while accessing data</b>.<br />"
						+ objError.Message + "<br />" + objError.Source;
			return;  //  and stop execution
		}

		// accept the changes to "fix" the current state of the DataSet contents
		objDataSet.AcceptChanges();

		// now set up event handler to react to changes to the rows in the table
		DataTable objTable = objDataSet.Tables["Books"];
		objTable.RowChanged += new DataRowChangeEventHandler(OnRowChanged);

		// now change some records in the Books table
		objTable.Rows[0]["Title"] = "Amateur Theatricals for Windows 2000";
		objTable.Rows[2]["PublicationDate"] = new DateTime(2001, 2, 11);

		// declare a variable to hold a DataView object
		DataView objDataView;

		// get DataView and set to show only modified rows
		objDataView = objDataSet.Tables[0].DefaultView;
		objDataView.RowStateFilter = (DataViewRowState)DataRowState.Modified;

		// display the contents of the modified rows
		dgrResult.DataSource = objDataView;
		dgrResult.DataBind();

		// see if there are any update errors anywhere in the DataSet
		if (objDataSet.HasErrors)
		{
			// check each table for errors in that table
			foreach (DataTable objThisTable in objDataSet.Tables)
			{
				if (objThisTable.HasErrors)
				{
					strResult += "One or more errors found in table '<b>"
							+ objThisTable.TableName + "</b>'<br />";

					// check each row in this table for errors
					foreach (DataRow objThisRow in objThisTable.Rows)
					{
						if (objThisRow.HasErrors)
						{
							strResult += "* Row with ISBN=<b>"
										+ objThisRow["ISBN"]
										+ "</b> has error <b>"
										+ objThisRow.RowError + "</b><br />";
						}
					} // row
				}
			} // table

		}

		outResult.InnerHtml = strResult;  // display the result

	}


	// event handler for the RowChanged event
	void OnRowChanged(Object objSender, DataRowChangeEventArgs objArgs)
	{
		// only react if the action is "Change"
		if (objArgs.Action == DataRowAction.Change)
		{
			// validate a new title
			if (objArgs.Row["Title"].ToString().IndexOf("Amateur") != -1)
				objArgs.Row.RowError = "'Amateur' is not a recognized book series prefix";

			// validate a new publication date
			if (((DateTime)objArgs.Row["PublicationDate"]).DayOfWeek == DayOfWeek.Sunday
					|| ((DateTime)objArgs.Row["PublicationDate"]).DayOfWeek == DayOfWeek.Saturday)
				objArgs.Row.RowError += "Publication date must be a weekday";

		}
	}

</script>


<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>

update-check-errors.aspx - 源码说明

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