.NET中常用的代码
整理了一些常用的.NET代码，贴出来供大家参考，并希望我们一起搜集更多的内容。
一、为GridView添加索引列
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<%# Container.DataItemIndex +1 %>
</ItemTemplate>
</asp:TemplateField>
二、批量删除列
模板列代码：
<asp:TemplateField HeaderText="选择">
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
</asp:TemplateField>
全选：
for (int i = 0; i < gv.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect");
chkSelect.Checked = true;
}
反选：
for (int i = 0; i < gv.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect");
chkSelect.Checked = !chkSelect.Checked;
}
取消选择：
for (int i = 0; i < gv.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect");
chkSelect.Checked = false;
}
删除：
for (int i = 0; i < gv.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect");
if (chkSelect.Checked)
{
//删除记录
}
}
三、删除表格选定记录int id = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; //在调用前必须指定DataKeyNames属性为要获取
的主键。
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString();
四、为按钮添加确认对话框
button.Attributes.Add("onclick","return confirm(’确认?’)");
private void grdCustomer_ItemDataBound(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
//点击表格打开
if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
e.Item.Attributes.Add("onclick","window.open(’Default.aspx?id=" + e.Item.Cells[0].Text + "
’);");
}
六、超连接列传递参数
＜asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id"
NavigateUrl="aaa.aspx?id=’
＜%# DataBinder.Eval(Container.DataItem, "数据字段1")%＞’ & name=’＜%# DataBinder.Eval
(Container.DataItem, "数据字段2")%＞’ /＞
七、绑定日期格式
e.items.cell["time"].text=DateTime.Parse(e.items.cell["time"].text.ToString("yyyy-MM-dd"))
八、统一捕获异常 Global.asax中：
protected void Application_Error(Object sender, EventArgs e) {
if (Server.GetLastError() is HttpUnhandledException)
Server.Transfer("MyErrorPage.aspx");
//编写添加到日志的代码Log.add();
}
九、自定义异常处理using System;
using System.Diagnostics;
namespace MyAppException
{
/// ＜summary＞
/// 从系统异常类ApplicationException继承的应用程序异常处理类。
/// 自动将异常内容记录到Windows NT/2000的应用程序日志
/// ＜/summary＞
public class AppException:System.ApplicationException
{
public AppException()
{
if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。");
}
public AppException(string message)
{
LogEvent(message);
}
public AppException(string message,Exception innerException)
{
LogEvent(message);
if (innerException != null)
{
LogEvent(innerException.Message);
}
}
//日志记录类
using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;
namespace MyEventLog
{
/// ＜summary＞
/// 事件日志记录类，提供事件日志记录支持
/// ＜remarks＞
/// 定义了4个日志记录方法 (error, warning, info, trace)
/// ＜/remarks＞
/// ＜/summary＞
public class ApplicationLog
{
/// ＜summary＞
/// 将错误信息记录到Win2000/NT事件日志中
/// ＜param name="message"＞需要记录的文本信息＜/param＞
/// ＜/summary＞
public static void WriteError(String message)
{
WriteLog(TraceLevel.Error, message);
}
/// ＜summary＞
/// 将警告信息记录到Win2000/NT事件日志中
/// ＜param name="message"＞需要记录的文本信息＜/param＞
/// ＜/summary＞
public static void WriteWarning(String message)
{
WriteLog(TraceLevel.Warning, message);
}
/// ＜summary＞
/// 将提示信息记录到Win2000/NT事件日志中
/// ＜param name="message"＞需要记录的文本信息＜/param＞
/// ＜/summary＞
public static void WriteInfo(String message)
{
WriteLog(TraceLevel.Info, message);
}
/// ＜summary＞
/// 将跟踪信息记录到Win2000/NT事件日志中
/// ＜param name="message"＞需要记录的文本信息＜/param＞
/// ＜/summary＞
public static void WriteTrace(String message)
{
WriteLog(TraceLevel.Verbose, message);
}
/// ＜summary＞
/// 格式化记录到事件日志的文本信息格式
/// ＜param name="ex"＞需要格式化的异常对象＜/param＞
/// ＜param name="catchInfo"＞异常信息标题字符串.＜/param＞
/// ＜retvalue＞
/// ＜para＞格式后的异常信息字符串，包括异常内容和跟踪堆栈.＜/para＞
/// ＜/retvalue＞
/// ＜/summary＞
public static String FormatException(Exception ex, String catchInfo)
{
StringBuilder strBuilder = new StringBuilder();
if (catchInfo != String.Empty)
{
strBuilder.Append(catchInfo).Append("\r\n");
}
strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace);
return strBuilder.ToString();
}
/// ＜summary＞
/// 实际事件日志写入方法
/// ＜param name="level"＞要记录信息的级别（error,warning,info,trace).＜/param＞
/// ＜param name="messageText"＞要记录的文本.＜/param＞
/// ＜/summary＞
private static void WriteLog(TraceLevel level, String messageText)
{
try
{
EventLogEntryType LogEntryType;
switch (level)
{
case TraceLevel.Error:
LogEntryType = EventLogEntryType.Error;
break;
case TraceLevel.Warning:
LogEntryType = EventLogEntryType.Warning;
break;
case TraceLevel.Info:
LogEntryType = EventLogEntryType.Information;
break;
case TraceLevel.Verbose:
LogEntryType = EventLogEntryType.SuccessAudit;
break;
default:
LogEntryType = EventLogEntryType.SuccessAudit;
break;
}
EventLog eventLog = new EventLog("Application",
ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName );
//写入事件日志
eventLog.WriteEntry(messageText, LogEntryType);
}
catch {} //忽略任何异常
}
} //class ApplicationLog
}
十、Panel 横向滚动，纵向自动扩展＜asp:panel style="overflow-x:scroll;overflow-y:auto;"＞＜/asp:panel＞
十一、DataGrid行随鼠标变色private void ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType!=ListItemType.Header)
{
e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style
["BACKGROUND-COLOR"]+"\"");
e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EEE6F8"+"\"");
}
}
十二、读取DataGrid控件的TextBox值foreach(DataGrid dgi in yourDataGrid.Items)
{
TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");
tb.Text
.
}
十三、当点击编辑键时，控制文本框的大小private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e)
{
for(int i=0;i＜e.Item.Cells.Count-1;i++)
if(e.Item.ItemType==ListItemType.EditType)
{
e.Item.Cells[i].Attributes.Add("Width", "80px")
}
}
十四、弹出对话框private static string ScriptBegin = "＜script language=\"JavaScript\"＞";
private static string ScriptEnd = "＜/script＞";
public static void ConfirmMessageBox(string PageTarget,string Content)
{
string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue)
{window.location=’"+PageTarget+"’;}";
ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd;
Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler;
ParameterPage.RegisterStartupScript("confirm",ConfirmContent);
//Response.Write(strScript);
}
一、为GridView添加索引列
<asp:TemplateField HeaderText="ID"> <ItemTemplate> <%# Container.DataItemIndex +1 %> </ItemTemplate></asp:TemplateField>二、批量删除列
模板列代码：
<asp:TemplateField HeaderText="选择"> <ItemTemplate> <asp:CheckBox ID="chkSelect" runat="server" /> </ItemTemplate></asp:TemplateField>for (int i = 0; i < gv.Rows.Count; i++) {
CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = true; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = !chkSelect.Checked; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); chkSelect.Checked = false; }for (int i = 0; i < gv.Rows.Count; i++) { CheckBox chkSelect = (CheckBox)gv.Rows[i].FindControl("chkSelect"); if (chkSelect.Checked) {
//删除记录 } }三、删除表格选定记录
int id = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; //在调用前必须指定DataKeyNames属性为要获取的主键。string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString();四、为按钮添加确认对话框
button.Attributes.Add("onclick","return confirm(’确认?’)"); 五、点击表格行链接另一页
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { //点击表格打开 if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem) e.Item.Attributes.Add("onclick","window.open(’Default.aspx?id=" + e.Item.Cells[0].Text + "’);"); } 六、超连接列传递参数
＜asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id=’ ＜%# DataBinder.Eval(Container.DataItem, "数据字段1")%＞’ & name=’＜%# DataBinder.Eval(Container.DataItem, "数据字段2")%＞’ /＞ 七、绑定日期格式
e.items.cell["time"].text=DateTime.Parse(e.items.cell["time"].text.ToString("yyyy-MM-dd")) 八、统一捕获异常 Global.asax中：
protected void Application_Error(Object sender, EventArgs e) { if (Server.GetLastError() is HttpUnhandledException) Server.Transfer("MyErrorPage.aspx"); //编写添加到日志的代码Log.add();} 九、自定义异常处理
using System; using System.Diagnostics; namespace MyAppException { /// ＜summary＞ /// 从系统异常类ApplicationException继承的应用程序异常处理类。 /// 自动将异常内容记录到Windows NT/2000的应用程序日志 /// ＜/summary＞ public class AppException:System.ApplicationException { public AppException() { if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。"); } public AppException(string message) { LogEvent(message); } public AppException(string message,Exception innerException) { LogEvent(message); if (innerException != null) { LogEvent(innerException.Message); } } //日志记录类 using System; using System.Configuration; using System.Diagnostics; using System.IO; using System.Text; using System.Threading; namespace MyEventLog { /// ＜summary＞ /// 事件日志记录类，提供事件日志记录支持 /// ＜remarks＞ /// 定义了4个日志记录方法 (error, warning, info, trace) /// ＜/remarks＞ /// ＜/summary＞ public class ApplicationLog { /// ＜summary＞ /// 将错误信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteError(String message) { WriteLog(TraceLevel.Error, message); } /// ＜summary＞ /// 将警告信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteWarning(String message) { WriteLog(TraceLevel.Warning, message); } /// ＜summary＞ /// 将提示信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteInfo(String message) { WriteLog(TraceLevel.Info, message); } /// ＜summary＞ /// 将跟踪信息记录到Win2000/NT事件日志中 /// ＜param name="message"＞需要记录的文本信息＜/param＞ /// ＜/summary＞ public static void WriteTrace(String message) { WriteLog(TraceLevel.Verbose, message); } /// ＜summary＞ /// 格式化记录到事件日志的文本信息格式 /// ＜param name="ex"＞需要格式化的异常对象＜/param＞ /// ＜param name="catchInfo"＞异常信息标题字符串.＜/param＞ /// ＜retvalue＞ /// ＜para＞格式后的异常信息字符串，包括异常内容和跟踪堆栈.＜/para＞ /// ＜/retvalue＞ /// ＜/summary＞ public static String FormatException(Exception ex, String catchInfo) { StringBuilder strBuilder = new StringBuilder(); if (catchInfo != String.Empty) { strBuilder.Append(catchInfo).Append("\r\n"); } strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace); return strBuilder.ToString(); } /// ＜summary＞ /// 实际事件日志写入方法 /// ＜param name="level"＞要记录信息的级别（error,warning,info,trace).＜/param＞ /// ＜param name="messageText"＞要记录的文本.＜/param＞ /// ＜/summary＞ private static void WriteLog(TraceLevel level, String messageText) { try { EventLogEntryType LogEntryType; switch (level) { case TraceLevel.Error: LogEntryType = EventLogEntryType.Error; break; case TraceLevel.Warning: LogEntryType = EventLogEntryType.Warning; break; case TraceLevel.Info: LogEntryType = EventLogEntryType.Information; break; case TraceLevel.Verbose: LogEntryType = EventLogEntryType.SuccessAudit; break; default: LogEntryType = EventLogEntryType.SuccessAudit; break; } EventLog eventLog = new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName ); //写入事件日志 eventLog.WriteEntry(messageText, LogEntryType); } catch {} //忽略任何异常 } } //class ApplicationLog } 十、Panel 横向滚动，纵向自动扩展
＜asp:panel style="overflow-x:scroll;overflow-y:auto;"＞＜/asp:panel＞十一、DataGrid行随鼠标变色
private void ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { if (e.Item.ItemType!=ListItemType.Header) { e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\""); e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EEE6F8"+"\""); } } 十二、读取DataGrid控件的TextBox值
foreach(DataGrid dgi in yourDataGrid.Items) { TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId"); tb.Text. } 十三、当点击编辑键时，控制文本框的大小
private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e) { for(int i=0;i＜e.Item.Cells.Count-1;i++) if(e.Item.ItemType==ListItemType.EditType) { e.Item.Cells[i].Attributes.Add("Width", "80px") } } 十四、弹出对话框
private static string ScriptBegin = "＜script language=\"JavaScript\"＞"; private static string ScriptEnd = "＜/script＞"; public static void ConfirmMessageBox(string PageTarget,string Content) { string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}"; ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd; Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler; ParameterPage.RegisterStartupScript("confirm",ConfirmContent); //Response.Write(strScript); } 
