参数
- username
-
为其更新密码的用户。
- oldPassword
-
指定的用户的当前密码。
- newPassword
-
指定的用户的新密码。
返回值
如果密码成功更新，则返回 true。如果提供的旧密码无效，用户被锁定或数据库中不存在该用户，则返回 false。
备注
Membership 类调用此方法来更新 ASP.NET 应用程序配置文件 (Web.config) 中指定的 SQL Server 数据库用户的密码。
最大密码长度是 128 个字符。
如果为 ChangePassword 方法提供了错误的密码，跟踪无效密码尝试次数的内部计数器递增 1。这可能导致用户被锁定并无法登录，直至调用 UnlockUser 方法清除锁定状态为止。如果提供了正确的密码且用户当前未被锁定，则跟踪无效密码和密码答案尝试次数的内部计数器将重置为零。有关更多信息，请参见 MaxInvalidPasswordAttempts 和 PasswordAttemptWindow 属性。
先通过 Membership 类的 Provider 属性获得一个对 SqlMembershipProvider 实例的引用后，可直接调用 ChangePassword 方法。Provider 属性公开应用程序的 Web.config 文件中指定的 defaultProvider。而配置的提供程序则不是使用 Providers 引用的默认提供程序。
还可以通过使用 ChangePassword 方法更改用户密码。
删除所有参数值的前导和尾随空格。
示例
下面的代码示例修改指定用户的密码。
View Code
<%@ Page Language="C#" %> <%@ Import Namespace="System.Web.Security" %> <mce:script runat="server"><!-- public void ChangePassword_OnClick(object sender, EventArgs args) { try { // Update the password. //User.Identity.Name = "laozhai"; if (Membership.Provider.ChangePassword("laozhai", OldPasswordTextbox.Text, PasswordTextbox.Text)) { Msg.Text = "Password changed."; return; } } catch { } Msg.Text = "Password change failed. Please re-enter your values and try again."; } // --></mce:script> <html> <head> <title>Change Password</title> </head> <body> <form id="Form1" runat="server"> <h3>Change Password for <%=User.Identity.Name%></h3> <asp:Label id="Msg" ForeColor="maroon" runat="server" /> <table CellPadding="3" border="0"> <tr> <td>Old Password:</td> <td><asp:Textbox id="OldPasswordTextbox" runat="server" TextMode="Password" /></td> <td><asp:RequiredFieldValidator id="OldPasswordRequiredValidator" runat="server" ControlToValidate="OldPasswordTextbox" ForeColor="red" Display="Static" ErrorMessage="Required" /></td> </tr> <tr> <td>Password:</td> <td><asp:Textbox id="PasswordTextbox" runat="server" TextMode="Password" /></td> <td><asp:RequiredFieldValidator id="PasswordRequiredValidator" runat="server" ControlToValidate="PasswordTextbox" ForeColor="red" Display="Static" ErrorMessage="Required" /></td> </tr> <tr> <td>Confirm Password:</td> <td><asp:Textbox id="PasswordConfirmTextbox" runat="server" TextMode="Password" /></td> <td><asp:RequiredFieldValidator id="PasswordConfirmRequiredValidator" runat="server" ControlToValidate="PasswordConfirmTextbox" ForeColor="red" Display="Static" ErrorMessage="Required" /> <asp:CompareValidator id="PasswordConfirmCompareValidator" runat="server" ControlToValidate="PasswordConfirmTextbox" ForeColor="red" Display="Static" ControlToCompare="PasswordTextBox" ErrorMessage="Confirm password must match password." /> </td> </tr> <tr> <td></td> <td><asp:Button id="ChangePasswordButton" Text="Change Password" OnClick="ChangePassword_OnClick" runat="server" /></td> </tr> </table> </form> </body> </html>
使用方法：
在已有的项目DNNDEMO中添加一个testChagePwd.aspx文件，然后将上面的代码粘贴过去。
这里测试User.Identity.Name为空，一次我们必须认为将User.Identity.Name = "laozhai";这个参数传进去。
测试修改密码成功。
下面是通过reflector得到的源码
View Code
public override bool ChangePassword(string username, string oldPassword, string newPassword) { int num; bool flag; SecUtility.CheckParameter(ref username, true, true, true, 0x100, "username"); SecUtility.CheckParameter(ref oldPassword, true, true, false, 0x80, "oldPassword"); SecUtility.CheckParameter(ref newPassword, true, true, false, 0x80, "newPassword"); string salt = null; if (!this.CheckPassword(username, oldPassword, false, false, out salt, out num)) { return false; } if (newPassword.Length < this.MinRequiredPasswordLength) { throw new ArgumentException(SR.GetString("Password_too_short", new object[] { "newPassword", this.MinRequiredPasswordLength.ToString(CultureInfo.InvariantCulture) })); } int num3 = 0; for (int i = 0; i < newPassword.Length; i++) { if (!char.IsLetterOrDigit(newPassword, i)) { num3++; } } if (num3 < this.MinRequiredNonAlphanumericCharacters) { throw new ArgumentException(SR.GetString("Password_need_more_non_alpha_numeric_chars", new object[] { "newPassword", this.MinRequiredNonAlphanumericCharacters.ToString(CultureInfo.InvariantCulture) })); } if ((this.PasswordStrengthRegularExpression.Length > 0) && !Regex.IsMatch(newPassword, this.PasswordStrengthRegularExpression)) { throw new ArgumentException(SR.GetString("Password_does_not_match_regular_expression", new object[] { "newPassword" })); } string objValue = base.EncodePassword(newPassword, num, salt); if (objValue.Length > 0x80) { throw new ArgumentException(SR.GetString("Membership_password_too_long"), "newPassword"); } ValidatePasswordEventArgs e = new ValidatePasswordEventArgs(username, newPassword, false); this.OnValidatingPassword(e); if (e.Cancel) { if (e.FailureInformation != null) { throw e.FailureInformation; } throw new ArgumentException(SR.GetString("Membership_Custom_Password_Validation_Failure"), "newPassword"); } try { SqlConnectionHolder connection = null; try { connection = SqlConnectionHelper.GetConnection(this._sqlConnectionString, true); this.CheckSchemaVersion(connection.Connection); SqlCommand command = new SqlCommand("dbo.aspnet_Membership_SetPassword", connection.Connection); command.CommandTimeout = this.CommandTimeout; command.CommandType = CommandType.StoredProcedure; command.Parameters.Add(this.CreateInputParam("@ApplicationName", SqlDbType.NVarChar, this.ApplicationName)); command.Parameters.Add(this.CreateInputParam("@UserName", SqlDbType.NVarChar, username)); command.Parameters.Add(this.CreateInputParam("@NewPassword", SqlDbType.NVarChar, objValue)); command.Parameters.Add(this.CreateInputParam("@PasswordSalt", SqlDbType.NVarChar, salt)); command.Parameters.Add(this.CreateInputParam("@PasswordFormat", SqlDbType.Int, num)); command.Parameters.Add(this.CreateInputParam("@CurrentTimeUtc", SqlDbType.DateTime, DateTime.UtcNow)); SqlParameter parameter = new SqlParameter("@ReturnValue", SqlDbType.Int); parameter.Direction = ParameterDirection.ReturnValue; command.Parameters.Add(parameter); command.ExecuteNonQuery(); int status = (parameter.Value != null) ? ((int) parameter.Value) : -1; if (status != 0) { string exceptionText = this.GetExceptionText(status); if (this.IsStatusDueToBadPassword(status)) { throw new MembershipPasswordException(exceptionText); } throw new ProviderException(exceptionText); } flag = true; } finally { if (connection != null) { connection.Close(); connection = null; } } } catch { throw; } return flag; }