Asp.Net碎知识
在aspx页面 获取值： UserModel user=new UserModel();实例化 user.Address=context["txtAddress"]; 如果前台不需要的字段，但是数据库中有:user.Money=0;
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MD5加密 放在一个Tool公共类库(别的项目也可以用)里就ok了
public string GetMd5Code(string str) { //MD5是抽象类 ，System.Security.Cryptograph.MD5 MD5:HashAlgo MD5继承哈希 MD5 md5 = MD5.Create(); ////////////////////.制定编码格式--Default byte[] oldStr = system.Text.Encoding.Default.getBytes(str); //将传过来的str进行编码 byte[] md5str = md5.ComputerHash(oldStr); StringBuilder sb = new StringBuilder(); for(int i = 0; i < md5str.Lenght; i++) { sb.Append(md5str[i].ToString("x2")); //转换成16(x)进制，2保证加密后的密文长度一样 } return sb.Tostring(); }
绑定数据++++修改删除++++提示
<table width="100%" border="0" cellpadding="0" cellspacing="0" class="list_table"> <tr> <th width="100">序号</th> <th width="100">标题</th> <th width="100">内容</th> <th>关键字</th> <th>描述</th> <th>添加时间</th> <th>操作</th> </tr> <asp:Repeater ID="Repeater12" runat="server" OnItemCommand="Repeater12_ItemCommand"> <ItemTemplate> <tr> <td><%#Eval( "ID") %></td> <td><%#Eval( "Title") %></td> <td><%#Eval( "Cont") %></td> <td><%#Eval( "Keys") %></td> <td><%#Eval( "Des") %></td> <td><%#Eval( "AddTime") %></td> <td> <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Del" CommandArgument='<%#Eval("ID") %>'>删除</asp:LinkButton> <asp:LinkButton ID="LinkButton2" runat="server" CommandName="Update" CommandArgument='<%#Eval("ID") %>'>修改</asp:LinkButton> <asp:Label ID="Label1" runat="server" Text='<%#Eval("NewID") %>' Visible="false"></asp:Label> <asp:LinkButton ID="LinkButton1" runat="server" CssClass="btn btn82 btn_del" CommandName="del" OnClientClick="return confirm('要删除吗？')">删除</asp:LinkButton> <asp:Label ID="Label2" runat="server" Text='<%#Eval("NewID") %>' Visible="false"></asp:Label> <asp:LinkButton ID="LinkButton2" runat="server" CommandName="Update" CommandArgument='<%#Eval("NewID")%>'>修改</asp:LinkButton> </td> </tr> </ItemTemplate> </asp:Repeater> </table>
if(e.CommandName == "Del") { //string strid = ((Label)e.Item.FindControl("Label1")).Text; // int Id = Convert.ToInt32(strid); int id = Convert.ToInt32(e.CommandArgument.ToString()); int result = BLL.UserBLL.DelUser(id); if(result > 0) { // Response.Write("你已经删除了该用户"); Page.ClientScript.RegisterClientScriptBlock(GetType(), "", "<script language=javascript>alert('你已经删除了该用户')</script>"); bindUserList(); } }
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private int _age; piblic int Age; { get { return _age; } set { if(value < 0 || value > 100) { _age = 18; } else { _age = value; } } }
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隐藏传递修改的ID
<asp:HiddenField ID="hide" runat="server" /> int id = Convert.ToInt32(hide.Value);
if(!IsPostBack) { if(Request.QueryString["NewsID"] != null) { hd_id.Value = Request.QueryString["NewsID"].ToString(); int id = Convert.ToInt32(Request.QueryString["NewsID"]); NewsType(); //将下拉列表中的值娶过来 GetSingNews(id); } }
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弹出框Page.ClientScript.RegisterClientScriptBlock(GetType(), "", "<script language=javascript>alert('请选择图片')</script>");
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配置数据库文件：
<connectionStrings>
<add name="str" connectionString="server=.;database=JinKeLi;Integrated Security=True " />
</connectionStrings>
<appSettings>
<add key="sqlcon" value="server=.;database=JinKeLi;Integrated Security=True" />
</appSettings>
public static string constr = System.Configuration.ConfigurationSettings.AppSettings["sqlcon"];
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验证码知识：
<script> function getVCode() { var vcode = document.getElementById("vcode"); vcode.src = "ValidateCode.ashx?i=" + Math.random(); } </script>
<p> 验证码： <input type="text" name="txtvcode" class="txt" /> <img src="ValidateCode.ashx" id="vcode" align="middle" alt="看不清，换一张" onclick="getVCode()" /> <%--后台生成的图片--%> <a href="javascript:getVCode()" class="hyz"> 换一张</a> </p>
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百度编辑器知识
<!-- 引用文件 顺序不能出错--> <script type="text/javascript" src="../../ueditor/ueditor.config.js"> </script> <script type="text/javascript" src="../../ueditor/ueditor.all.js"> </script> <link rel="stylesheet" href="../../ueditor/themes/default/dialogbase.css" /> <!-- 引用文件结束--> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <tr style="width:500px; height:230px;"> <td class="td_right"> 内容页：</td> <td class="" style="width:150px;height:80px;"> <textarea name="MyEditor" style="width: 500px; height:200px;" id="MyEditor" runat="server" onblur="setUeditor()" cols="30" rows="10"> </textarea> <script type="text/javascript"> < !--new一个实体--> var editor = new baidu.editor.ui.Editor(); editor.render("MyEditor"); function setUeditor() { var myEditor = document.getElementById("MyEditor") myEditor.value = editor.getContent(); } </script> <asp:Button ID="Btn_submit" runat="server" Text="输出editor的值" OnClick="Btn_submit_Click" /> <!-- Lable是显示文字--> <asp:Label ID="Label1" runat="server" Text="Label"> </asp:Label> </td> </tr>
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关于新闻类别的传递和修改，接受的方法
接受用： DropDownList1.SelectedValue = dt.Rows[0]["NewsType"].ToString(); 但是先绑定类型源 DropDownList1.SelectedItem.Text = dt.Rows[0]["ProName"].ToString(); 获取值： DropDownList1.Text = DropDownList1.SelectedValue; DropDownList1.Text = DropDownList1.SelectedValue; 添加的时候用
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从客户端(MyEditor="<p><img src="/uedito...")中检测到有潜在危险的 Request.Form 值。 ValidateRequest="false"
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public string GetImgType(string typeid) //将类型装换成文字 { DataTable dt = database.GetDt("select * from tb_ImgageType where id=" + typeid); if(dt != null && dt.Rows.Count > 0) { return dt.Rows[0]["TypeName"].ToString(); } else { return ""; } }
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将路径转换成图片
<td class="text-l"><img src='<%#Eval("ConfigLogo") %>' /></td>
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sqlparmeter 防止参数注入的另一种写法：
StringBuilder strSql = new StringBuilder(); strSql.Append("select Id,LoginId,LoginPwd,Name,Address,Phone,Mail,UserRoleId,UserStateId,Money from Users "); strSql.Append(" where LoginId=@LoginId"); SqlParameter[] parameters = { new SqlParameter("@LoginId", SqlDbType.NVarChar, 50) }; parameters[0].Value = loginid;
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<span style="color:Red"><%=LoginIdMsg %></span>前台 public string LoginIdMsg { get; set; } 后台 LoginIdMsg = loginidmsg; 这样把后台要返回的数据，就可以在前台展示出来
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记住我：
<asp:CheckBox ID="cbAutoLogin" runat="server" />使我保持登录状态
protected void Page_Load(object sender, EventArgs e) { if(!IsPostBack) { if(Request.Cookies["username"] != null && Request.Cookies["pwd"] != null) { this.username.Text = Request.Cookies["username"].Value; this.pwd.Text = Request.Cookies["pwd"].Value; } } } protected void Button2_Click(object sender, EventArgs e) { Response.Cookies["username"].Expires = DateTime.Now.AddDays(-1); Response.Cookies["pwd"].Expires = DateTime.Now.AddDays(-1); if(cbAutoLogin.Checked) { Response.Cookies["username"].Expires = DateTime.Now.AddDays(7); Response.Cookies["pwd"].Expires = DateTime.Now.AddDays(7); } Response.Cookies["username"].Value = this.username.Text.Trim(); Response.Cookies["pwd"].Value = this.pwd.Text.Trim(); }
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Session赋值，取值
登录的时候用--Session记录住用户名 Session["username"] = name; 赋值 < li > 欢迎 <%= Session["username"] %> < /li> if（ Session["name"] == null || Session["name"].Tostring() == ""） { reposnse.Redicrt("Login"); } 关于Session记录登录用户的情况： 在其他页面程序进行 操作时， 要判断是否在登录状态， 只要在同一个作用域内， 就可以引用Session了
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性别：
<asp:RadioButton ID="RadioButton1" runat="server" GroupName="sex" Text="男" />
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="sex" Text="女" />
<asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="性别" />
protected void Button4_Click(object sender, EventArgs e) { string s = ""; if(RadioButton1.Checked) { s = RadioButton1.Text; } if(RadioButton2.Checked) { s = RadioButton2.Text; } Response.Write("<script>alert('你的性别是：" + s + "')</script>"); }
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sqlparmeter的另外一种写法：
StringBuilder strSql = new StringBuilder(); strSql.Append("delete from Books "); strSql.Append(" where ISBN=@ISBN and Id=@Id "); SqlParameter[] parameters = { new SqlParameter("@ISBN", SqlDbType.NVarChar, 50), new SqlParameter("@Id", SqlDbType.Int, 4) }; parameters[0].Value = ISBN; parameters[1].Value = Id; int rows = DbHelperSQL.ExecuteSql(strSql.ToString(), parameters); if(rows > 0) { return true; } else { return false; }
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获取用户输入的值
string name=context.request["txtName"];
string pwd=context.request["txtPwd"];
创建模板
string path = context.request["Login.html"]; string html = system.IO.File.MapPath(path); string sql = "select * from users where name=@name and pwd=@pwd"; SqlParsms[] sps = { new Sqlparams("@name", name), new Sqlparams("@pwd", pwd) } int result = Convert.Into32(sqlhelper.ExectuScalar(sql, sps)); if(result > 0) { context.request.write("<script>alert('登陆成功')</script>"); context.requset.Redict..... } else { context.request.write("<script>alert('登录失败')</script>"); html = html.replace("@txtname", name).replace("$txtpwd", ""); }
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if(UserBLL.CheckUsers(mm) <= 0) { MessageBox.Show("用户不存在"); DialogResult qq = MessageBox.Show("确定注册吗", "不", MessageBoxButtons.YesNoCancel); if(qq == DialogResult.Yes) { AddAdmin AAA = new AddAdmin(); AAA.Show(); this.Hide(); } else { txtBoxUser.Text = ""; pwd = txtBoxPwd.Text = ""; } return; }
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ViewState用法：
<form action="Login.ashx" method="post"> <table style=" margin:150px auto"> <input type="hidden" name="ViewState" value="123" /> <tr><td colspan="2" style=" text-align:center"> 登录系统</td></tr> <tr><td><label for="username">用户名：</label></td> <td><input type="text" name="username" id="username" value="$name" /></td> </tr> <tr> <td><label for="pwd">密码：</label></td> <td><input type="text" name="pwd" id="pwd" value="$pwd" /></td> </tr> <tr> <td colspan="2" style=" text-align:center"><input type="submit" value="登陆" id="btn1" /></td> </tr> </table> </form>
string viewstate = context.Request["ViewState"]; bool IsPostBack = !string.IsNullOrEmpty(viewstate); if(!IsPostBack) {} else { if() {} else { context.Response.Write("<script>alert('登陆失败！');</script>"); loginhtml = loginhtml.Replace("$name", name).Replace("$pwd", ""); context.Response.Write(loginhtml); } }
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性别知识点：
protected void Button3_Click(object sender, EventArgs e) { string s = ""; if(RadioButton1.Checked) { s = RadioButton1.Text; } if(RadioButton2.Checked) { s = RadioButton2.Text; } Response.Write("<script>alert('你的相别是" + s + "')</script>"); }
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public void InitDropDownList1() //下拉列表添加数据 { //仅仅定义了一个方法，InitDropDownList1 //单个填 DropDownList1.Items.Add("141"); DropDownList1.Items.Add("142"); DropDownList1.Items.Add("143"); ListItem item1 = new ListItem("141", "1"); ListItem item2 = new ListItem("141", "1"); ListItem item3 = new ListItem("141", "1"); ListItem item4 = new ListItem("141", "1"); string[] items = { "141", "142", "143", "144" }; DropDownList1.DataSource = items; DropDownList1.DataBind(); //绑定数据 //绑定数据库中的某张表 string sql = "select * from Province"; DataSet da = sqlHelper.GetDataSet(sql); DropDownList1.DataSource = da; DropDownList1.DataTextField = "ProvinceName"; //获取市区 DropDownList1.DataValueField = "ProvinceID"; DropDownList1.DataBind(); }
Visual Studio Ultimate 2013 KEY（密钥）：BWG7X-J98B3-W34RT-33B3R-JVYW9
Visual Studio Premium 2013 KEY（密钥）：FBJVC-3CMTX-D8DVP-RTQCT-92494
Visual Studio Professional 2013 KEY（密钥）： XDM3T-W3T3V-MGJWK-8BFVD-GVPKY
Team Foundation Server 2013 KEY（密钥）：MHG9J-HHHX9-WWPQP-D8T7H-7KCQG
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IsPostBack 是Page类有一个bool类型的属性，用来判断针对当前Form的请求是第一次还是非第一次，IsPostBack=false时表示是第一次请求，当IsPostBack=true时，表示是非第一次请求。因
为第一次请求的时候会执行Page_Load，在非第一次请求的时候也会执行Page_Load。为什么对同一个Form有多次请求呢？asp.net中引入了服务器端事件，支持服务器端事件的控件，会发出对当前Form的请求，这样在很多情形下我们就需要区别是否是对这个Form的第一次请求。
二、IsPostBack结论
1、对于使用Server.Transfer进行进行迁移时迁移到的页面其IsPostBack=false 每次刷新页面都是第一次加载页面; 2. Post方式如果Request中没有请求值，即Request.Form =null则IsPostBack＝false；Get方式如果Request中没有请求值，即Request.QueryString =null则IsPostBack＝false。
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