C#:数据交互
JS与Web交互：http://www.docin.com/p-76710976.html
一、WinForm的WebBrowser控件与JS交互数据：
1、C#类内的代码执行JS脚本函数：
给C#类中的WebBrowser控件加载一个包含JS脚本的HTML页面：this.webBrowser1.Url = new System.Uri(Application.StartupPath + "\\kindeditor\\e.html", System.UriKind.Absolute);
C#类内的代码执行JS脚本的setContent（str）函数：webBrowser.Document.InvokeScript("setContent", new object[] { content });//content为C#中自定义的string类型字段。
2、脚本执行C#类内的函数：
WebBrowser.ObjectForScripting:返回或者设置一个对象,可以通过脚本访问包含的代码。譬如：在C#类中设置this.webBrowser.ObjectForScripting = this; 则webBrowser包含的脚本就可以执行this(C#类)类内的函数（如：GetContent()）。JS脚本执行this类内的GetContent公共方法：window.external.GetContent()；
二、Web与JS交换数据
1、JS（$.ajax）向制定的.ashx文件中的方法传输数据。需设置url项为制定文件的方法，如： url: "Service/EasyUiService.ashx?Method=Login"。具体代码如下：
<script type="text/javascript"> $(function() { $("#loginWindow").window({ title: '登陆窗口', width: 290, height: 180, modal: true, shadow: false, closable: false, maximizable: false, minimizable: false, collapsible: false, resizable: false }); $("#btnLogin").click(function() { var username = document.getElementById("username").value; var password = document.getElementById("password").value; loginSys(username, password); }); $("#aboutSys").click(function() { $.messager.alert('关于', 'JQuery EasyUi练习!', 'info'); }); }); //登陆操作 function loginSys(username,password) { $.ajax({ type: "POST", dataType: "json", //cache:true, url: "Service/EasyUiService.ashx?Method=Login", data: { username: username, password: password }, success: function(json) { if (json.Flag[0].Status == 1) { window.location.href = "Index.aspx"; } else { $.messager.alert('错误', '账号或密码错误!', 'error'); } }, error: function() { $.messager.alert('错误', '获取账号信息失败...请联系管理员!', 'error'); } }); } </script>
EasyUiService.ashx文件中的Login函数对应代码如下：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.SessionState; using System.Reflection; using System.Text; namespace EasyUi.Web.Service { public class EasyUiService : IHttpHandler, IRequiresSessionState { HttpRequest Request; HttpResponse Response; HttpSessionState Session; HttpServerUtility Server; HttpCookie Cookie; public void ProcessRequest(HttpContext context) { //不让浏览器缓存 context.Response.Buffer = true; context.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1); context.Response.AddHeader("pragma", "no-cache"); context.Response.AddHeader("cache-control", ""); context.Response.CacheControl = "no-cache"; context.Response.ContentType = "text/plain"; Request = context.Request; Response = context.Response; Session = context.Session; Server = context.Server; string method = Request["Method"].ToString(); MethodInfo methodInfo = this.GetType().GetMethod(method); methodInfo.Invoke(this, null); } /// <summary> /// 登陆 /// </summary> public void Login() { string username = Request["username"].ToString(); string password = Request["password"].ToString(); int flag = UserAccess.GetInstance().Login(username, password); int? roleId = RoleAccess.GetInstance().GetRoleIdByUsername(username); Cookie = new HttpCookie("RoleInfo"); Cookie["roleId"] = roleId.ToString(); Cookie.Expires = DateTime.Now.AddMonths(1); Response.Cookies.Add(Cookie); JsonConvert<object> jc = new JsonConvert<object>(); Response.Write(jc.ToStatus(flag)); } public bool IsReusable { get { return false; } } } }
Response.Write()返回值
注释：ashx是一般应用程序，我现在就是用jquery和.NET开发网站的，我们用ashx作为通讯层，jquery用post传参，ashx页面接收参数，然后返回值。浏览页面时是无法看到我们编写的代码的。
2、Web与JQuery-EasyUI交换数据
1)树：通过URL地址指向指定文件中的函数获取Json数据
$(function() { //系统管理树 $("#sysManageTree").tree({ checkbox: false, url: 'Service/EasyUiService.ashx?Method=GetSysManageTree&RoleId=' + GetCookie("RoleInfo").substring(7,8), onClick: function(node) { $(this).tree('toggle', node.target); //$("#contentPage").attr("src", node.attributes); loadFrame(node.attributes); } // onContextMenu: function(e, node) { // e.preventDefault(); // $('#sysManageTree').tree('select', node.target); // $('#treeMenu').menu('show', { // left: e.pageX, // top: e.pageY // }); // } }); }
2）数据网格：通过URL地址指向指定文件中的函数获取Json数据
$('#roleManageGrid').datagrid({ //title: '角色管理', //iconCls: 'icon-save', collapsible: false, fitColumns: true, singleSelect: true, remoteSort: false, sortName: 'RoleName', sortOrder: 'desc', nowrap: true, method: 'get', loadMsg: '正在加载数据...', url: '../Service/EasyUiService.ashx?Method=GetRoleInfo', frozenColumns: [[ { field: 'ck', checkbox: true } ]], columns: [[ { field: 'RoleId', title: '角色ID', width: 80, sortable: true }, { field: 'RoleName', title: '角色名称', width: 100,sortable:true }, { field: 'RoleDes', title: '角色描述', width: 100 } ]], pagination: true, pageNumber: 1, rownumbers: true, toolbar: [ { id: 'btnAdd', text: '添加角色', iconCls: 'icon-add', handler: function() { $("#roleName").val(""); $("#roleDes").val(""); addRoleDialog(); } }, '-', { id: 'btnEdit', text: '编辑角色', iconCls: 'icon-edit', handler: function() { var selected = $('#roleManageGrid').datagrid('getSelected'); if (selected) { var roleId = selected.RoleId; var roleName = selected.RoleName; var roleDes = selected.RoleDes; $("#roleName").val(roleName); $("#roleDes").val(roleDes); editRoleDialog(); } } }, '-', { id: 'btnDelete', text: '删除角色', disabled: true, iconCls: 'icon-remove', handler: function() { } } ], onLoadSuccess: function() { //$("#roleManageGrid").datagrid('reload'); }, onClickRow: function(rowIndex, rowData) { var roleId = rowData.RoleId; loadTree(roleId); RoleId = roleId; } }); });
参考：
对应的具体函数（可跳过）：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.SessionState; using System.Reflection; using System.Text; using XQH.EasyUi.Access; using XQH.EasyUi.Entity; namespace XQH.EasyUi.Web.Service { public class EasyUiService : IHttpHandler, IRequiresSessionState { HttpRequest Request; HttpResponse Response; HttpSessionState Session; HttpServerUtility Server; HttpCookie Cookie; public void ProcessRequest(HttpContext context) { //不让浏览器缓存 context.Response.Buffer = true; context.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1); context.Response.AddHeader("pragma", "no-cache"); context.Response.AddHeader("cache-control", ""); context.Response.CacheControl = "no-cache"; context.Response.ContentType = "text/plain"; Request = context.Request; Response = context.Response; Session = context.Session; Server = context.Server; string method = Request["Method"].ToString(); MethodInfo methodInfo = this.GetType().GetMethod(method); methodInfo.Invoke(this, null); } /// <summary> /// 登陆 /// </summary> public void Login() { string username = Request["username"].ToString(); string password = Request["password"].ToString(); int flag = UserAccess.GetInstance().Login(username, password); int? roleId = RoleAccess.GetInstance().GetRoleIdByUsername(username); Cookie = new HttpCookie("RoleInfo"); Cookie["roleId"] = roleId.ToString(); Cookie.Expires = DateTime.Now.AddMonths(1); Response.Cookies.Add(Cookie); JsonConvert<object> jc = new JsonConvert<object>(); Response.Write(jc.ToStatus(flag)); } /// <summary> /// 获取系统管理树 /// </summary> public void GetSysManageTree() { //SetModuleType("01"); SetModulePermission("01"); } /// <summary> /// 工作管理树 /// </summary> public void GetWorkManageTree() { SetModulePermission("02"); } /// <summary> /// 日常管理 /// </summary> public void GetDailyManageTree() { SetModulePermission("03"); } /// <summary> /// 其他事项 /// </summary> public void GetOtherTree() { SetModulePermission("04"); } /// <summary> /// 设置模块类型(现在只支持数据库修改) /// </summary> /// <param name="pid"></param> private void SetModuleType(string pid) { List<FunctionItemEntity> lsC = FunctionItemAccess.GetInstance().GetFunctionItemByPid(pid); List<FunctionItemEntity> lsP = FunctionItemAccess.GetInstance().GetFunctionNameById(pid); JsonConvert<FunctionItemEntity> jc = new JsonConvert<FunctionItemEntity>(); Response.Write(jc.ToTreeNode(lsC, lsP)); } /// <summary> /// 设置权限树 /// </summary> public void SetPermissionTree() { int roleId = Convert.ToInt32(Server.UrlDecode(Request["RoleId"].ToString())); string resultStr = string.Empty; List<string> lsP = new List<string>(); lsP = PermissionAccess.GetInstance().GetParentPermission(); //此处省略得到数据列表的代码 resultStr = ""; resultStr += "["; foreach (string item in lsP) { resultStr += "{"; List<PermissionEntity> lsC = new List<PermissionEntity>(); lsC = PermissionAccess.GetInstance().GetChildPermission(item); //如果某变电站下有线路 if (lsC.Count > 0) { resultStr += string.Format("\"id\": \"{0}\", \"text\": \"{1}\", \"state\": \"closed\"", item, item); resultStr += ",\"children\":["; for (int i = 0; i < lsC.Count; i++) { resultStr += "{"; resultStr += string.Format("\"id\": \"{0}\", \"text\": \"{1}\",\"checked\":{2} ", lsC[i].PermissionId, lsC[i].OperationName, RolePermissionAccess.GetInstance().IsPermissionOn(roleId,lsC[i].PermissionId) == null ? "false" : "true"); resultStr += "},"; } resultStr = resultStr.Substring(0, resultStr.Length - 1); resultStr += "]"; } else { resultStr += string.Format("\"id\": \"{0}\", \"text\": \"{1}\" ", item, item); } resultStr += "},"; } resultStr = resultStr.Substring(0, resultStr.Length - 1); resultStr += "]"; Response.Write(resultStr); } /// <summary> /// 设置模块操作权限 /// </summary> /// <param name="pid">父ID</param> private void SetModulePermission(string pid) { int roleId = Convert.ToInt32(Request.QueryString["RoleId"].ToString()); List<FunctionItemEntity> lsC = FunctionItemAccess.GetInstance().GetOperationPermission(pid, roleId); List<FunctionItemEntity> lsP = FunctionItemAccess.GetInstance().GetFunctionNameById(pid); JsonConvert<FunctionItemEntity> jc = new JsonConvert<FunctionItemEntity>(); Response.Write(jc.ToTreeNode(lsC, lsP)); } /// <summary> /// 获取角色信息 /// </summary> public void GetRoleInfo() { List<RoleEntity> ls = RoleAccess.GetInstance().GetRoleInfo(); JsonConvert<RoleEntity> jc = new JsonConvert<RoleEntity>(); Response.Write(jc.ToDataGrid(ls, ls.Count)); } /// <summary> /// 获取账号信息 /// </summary> public void GetUserInfo() { List<UserEntity> ls = UserAccess.GetInstance().GetUserInfo(); JsonConvert<UserEntity> jc = new JsonConvert<UserEntity>(); Response.Write(jc.ToDataGrid(ls,ls.Count)); } /// <summary> /// 设置权限 /// </summary> public void SetPermission() { string isChecked = Request["IsChecked"].ToString(); int roleId = Convert.ToInt32(Request["RoleId"].ToString()); string permissionId = Request["PermissionId"].ToString(); //如果为true,则添加权限 if (isChecked == "true") { RolePermissionAccess.GetInstance().AddPermission(roleId, permissionId); } else { RolePermissionAccess.GetInstance().DeletePermission(roleId, permissionId); } } public bool IsReusable { get { return false; } } } }
把对象转换成JSON对象（可跳过）
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Text; using Newtonsoft.Json; using XQH.EasyUi.Entity; /// <summary> /// 把对象转换成JSON对象 /// </summary> public class JsonConvert<T> { //------jquery ui tree json data------ //------树节点只支持 id,text,children,attributes,checked,state,iconCls等属性 //[ // { // "id":"01", // "text":"系统管理", // "parentid":"0", // "attributes":"", // "children": // [ // { // "id":"0101", // "text":"模块管理", // "parentid":"01", // "attributes":"web/modulemanage.aspx" // } // ] // } //] //------jquery ui datagrid json data------ //{ // "total":5, // "rows":[ // {"RoleId":"001","RoleName":"Name 1","RoleDes":"Address 11"}, // {"RoleId":"002","RoleName":"Name 1","RoleDes":"Address 11"}, // {"RoleId":"003","RoleName":"Name 1","RoleDes":"Address 11"}, // {"RoleId":"004","RoleName":"Name 1","RoleDes":"Address 11"}, // {"RoleId":"005","RoleName":"Name 1","RoleDes":"Address 11"} // ] //} //------jquery ui flag json data------ //{ // "Flag":[{"Status":"1"}] //} /// <summary> ///系统树节点数据 /// </summary> /// <param name="lsC">子信息</param> /// <param name="lsP">父信息</param> /// <returns></returns> public StringBuilder ToTreeNode(List<T> lsC,List<T> lsP) { StringBuilder jsonData = new StringBuilder(); jsonData.Append("["); jsonData.Append(JavaScriptConvert.SerializeObject(lsP[0]).ToLower()); jsonData.Replace("}", ","); jsonData.Append("\"children\":["); foreach (T item in lsC) { string jsonGroup = JavaScriptConvert.SerializeObject(item); jsonData.Append(jsonGroup.ToLower()); jsonData.Append(","); } //去掉末尾“,”号 if (lsC.Count > 0) jsonData = jsonData.Remove(jsonData.Length - 1, 1); jsonData.Append("]}]"); jsonData.Replace("functionname", "text"); jsonData.Replace("url", "attributes"); return jsonData; } public StringBuilder ToCheckedTreeNode(List<T> lsC, List<string> lsP) { StringBuilder jsonData = new StringBuilder(); jsonData.Append("[{"); foreach (string str in lsP) { jsonData.Append("\"id\":"); jsonData.Append("0"); jsonData.Append(","); jsonData.Append("\"text\":"); jsonData.Append(str); jsonData.Append(","); jsonData.Append("\"children\":["); } return jsonData; } /// <summary> /// 转换成datagrid格式的数据 /// </summary> /// <param name="ls">数据集合</param> /// <param name="total">总数</param> /// <returns></returns> public StringBuilder ToDataGrid(List<T> ls,int total) { StringBuilder jsonData = new StringBuilder(); jsonData.Append("{"); jsonData.Append("\"total\":"); jsonData.Append(total); jsonData.Append(","); jsonData.Append("\"rows\":"); jsonData.Append("["); foreach (T item in ls) { string jsonGroup = JavaScriptConvert.SerializeObject(item); jsonData.Append(jsonGroup); jsonData.Append(","); } if (ls.Count > 0) jsonData = jsonData.Remove(jsonData.Length - 1, 1); jsonData.Append("]}"); return jsonData; } /// <summary> /// 转换成状态格式的JSON数据 /// </summary> /// <param name="status"></param> /// <returns></returns> public StringBuilder ToStatus(int status) { StringBuilder jsonData = new StringBuilder(); jsonData.Append("{"); jsonData.Append("\"Flag\":"); jsonData.Append("[{"); jsonData.Append("\"Status\":"); jsonData.Append(status); jsonData.Append("}]"); jsonData.Append("}"); return jsonData; } }
3、其他Web与js交互问题（摘）：
问： 1.如何在JavaScript访问C#函数? 2.如何在JavaScript访问C#变量? 3.如何在C#中访问JavaScript的已有变量? 4.如何在C#中访问JavaScript函数? 问题1答案如下： javaScript函数中执行C#代码中的函数： 方法一：1、首先建立一个按钮，在后台将调用或处理的内容写入button_click中; 2、在前台写一个js函数，内容为document.getElementById("btn1").click(); 3、在前台或后台调用js函数，激发click事件，等于访问后台c#函数； 方法二：1、函数声明为public 后台代码(把public改成protected也可以) public string ss() { return("a"); } 2、在html里用 <%=fucntion()% >可以调用 前台脚本 <script language=javascript > var a = " <%=ss()% >"; alert(a); </script > 方法三：1、 <script language="javascript" > <!-- function __doPostBack(eventTarget, eventArgument) { var theForm = document.Form1; //指runat=server的form theForm.__EVENTTARGET.value = eventTarget; theFrom.__EVENTARGUMENT.value = eventArgument; theForm.submit(); } -- > </script > <input id="Button1" type="button" name="Button1" value="按钮" onclick="javascript:__doPostBack( 'Button1 ', ' ')" > 方法四： <script language="javascript" > function SubmitKeyClick() { if (event.keyCode == 13) { event.cancelBubble = true; event.returnValue = false; document.all.FunName.value="你要调用的函数名"； document.form[0].submit(); } } </script > <INPUT onkeypress="SubmitKeyClick()" id="aaa" type="text" > <input type="hidden" name="FunName" > 〈！--用来存储你要调用的函数 --〉 在.CS里有： public Page_OnLoad() { if (!Page.IsPost()) { string strFunName=Request.Form["FunName"]!=null?Request.Form["FunName"]:""; //根据传回来的值决定调用哪个函数 switch(strFunName) { case "enter()": enter() ; //调用该函数 break; case "其他": //调用其他函数 break; default: //调用默认函数 break; } } } public void enter() { //……比如计算某值 } 问题2.如何在JavaScript访问C#变量? 答案如下： 方法一：1、通过页面上隐藏域访问 <input id="xx" type="hidden" runat="server" > 方法二：1、如后台定义了PUBLIC STRING N;前台js中引用该变量的格式为 ' <%=n% > '或"+ <%=n% >+" 方法三：1、或者你可以在服务器端变量赋值后在页面注册一段脚本 " <script language= 'javascript ' >var temp=" + tmp + " </script >" tmp是后台变量，然后js中可以直接访问temp获得值。 3.如何在C#中访问JavaScript的已有变量? 答案如下： 方法一：1、前台使用静态文本控件隐藏域，将js变量值写入其中； 2、后台用request["id"]来获取值； 方法二：可以用cookie或session 4.如何在C#中访问JavaScript函数? 答案如下： c#代码中执行javaScript函数： 方法一：1、Page.RegisterStartupScript("ggg"," <script >SetVisible(1); </script >"); 方法二：使用Literal类，然后 private void Button2_Click(object sender, System.EventArgs e) { string str; str=" <script language= 'javascript ' >"; str+="selectRange()"; str+=" </script >"; //Literal1.Visible=true; Literal1.Text=str; }
4、Form之间交互
1）通过属性（字段）、函数、事件等
//Form1内的代码如下： //声明并实例化F2 Form2 form2 = new Form2(); private void Form1_Load(object sender, EventArgs e) { //添加本窗体的Size属性更变事件 this.SizeChanged += new EventHandler(Form1_SizeChanged); //F2顶端显示 form2.TopMost = true; //添加F2的滑动条的移动事件 form2.trackBar1.Scroll += new EventHandler(trackBar1_Scroll); form2.Show(); //固定F2的坐标 form2.Location = this.Location; } /// <summary> /// Size属性更变事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> void Form1_SizeChanged(object sender, EventArgs e) { form2.Size = this.Size; } /// <summary> /// 滑动条的移动事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> void trackBar1_Scroll(object sender, EventArgs e) { //设置透明度 this.Opacity = (double)form2.trackBar1.Value / 100.0; }
2）
