Add project files.

SmartDB/Components/Account/Pages/Manage/ChangePassword.razor

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+@page "/Account/Manage/ChangePassword"
+
+@using System.ComponentModel.DataAnnotations
+@using Microsoft.AspNetCore.Identity
+@using SmartDB.Data
+
+@inject UserManager<ApplicationUser> UserManager
+@inject SignInManager<ApplicationUser> SignInManager
+@inject IdentityUserAccessor UserAccessor
+@inject IdentityRedirectManager RedirectManager
+@inject ILogger<ChangePassword> Logger
+
+<PageTitle>Change password</PageTitle>
+
+<h3>Change password</h3>
+<StatusMessage Message="@message" />
+<div class="row">
+    <div class="col-md-6">
+        <EditForm Model="Input" FormName="change-password" OnValidSubmit="OnValidSubmitAsync" method="post">
+            <DataAnnotationsValidator />
+            <ValidationSummary class="text-danger" role="alert" />
+            <div class="form-floating mb-3">
+                <InputText type="password" @bind-Value="Input.OldPassword" class="form-control" autocomplete="current-password" aria-required="true" placeholder="Please enter your old password." />
+                <label for="old-password" class="form-label">Old password</label>
+                <ValidationMessage For="() => Input.OldPassword" class="text-danger" />
+            </div>
+            <div class="form-floating mb-3">
+                <InputText type="password" @bind-Value="Input.NewPassword" class="form-control" autocomplete="new-password" aria-required="true" placeholder="Please enter your new password." />
+                <label for="new-password" class="form-label">New password</label>
+                <ValidationMessage For="() => Input.NewPassword" class="text-danger" />
+            </div>
+            <div class="form-floating mb-3">
+                <InputText type="password" @bind-Value="Input.ConfirmPassword" class="form-control" autocomplete="new-password" aria-required="true" placeholder="Please confirm your new password." />
+                <label for="confirm-password" class="form-label">Confirm password</label>
+                <ValidationMessage For="() => Input.ConfirmPassword" class="text-danger" />
+            </div>
+            <button type="submit" class="w-100 btn btn-lg btn-primary">Update password</button>
+        </EditForm>
+    </div>
+</div>
+
+@code {
+    private string? message;
+    private ApplicationUser user = default!;
+    private bool hasPassword;
+
+    [CascadingParameter]
+    private HttpContext HttpContext { get; set; } = default!;
+
+    [SupplyParameterFromForm]
+    private InputModel Input { get; set; } = new();
+
+    protected override async Task OnInitializedAsync()
+    {
+        user = await UserAccessor.GetRequiredUserAsync(HttpContext);
+        hasPassword = await UserManager.HasPasswordAsync(user);
+        if (!hasPassword)
+        {
+            RedirectManager.RedirectTo("Account/Manage/SetPassword");
+        }
+    }
+
+    private async Task OnValidSubmitAsync()
+    {
+        var changePasswordResult = await UserManager.ChangePasswordAsync(user, Input.OldPassword, Input.NewPassword);
+        if (!changePasswordResult.Succeeded)
+        {
+            message = $"Error: {string.Join(",", changePasswordResult.Errors.Select(error => error.Description))}";
+            return;
+        }
+
+        await SignInManager.RefreshSignInAsync(user);
+        Logger.LogInformation("User changed their password successfully.");
+
+        RedirectManager.RedirectToCurrentPageWithStatus("Your password has been changed", HttpContext);
+    }
+
+    private sealed class InputModel
+    {
+        [Required]
+        [DataType(DataType.Password)]
+        [Display(Name = "Current password")]
+        public string OldPassword { get; set; } = "";
+
+        [Required]
+        [StringLength(100, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 6)]
+        [DataType(DataType.Password)]
+        [Display(Name = "New password")]
+        public string NewPassword { get; set; } = "";
+
+        [DataType(DataType.Password)]
+        [Display(Name = "Confirm new password")]
+        [Compare("NewPassword", ErrorMessage = "The new password and confirmation password do not match.")]
+        public string ConfirmPassword { get; set; } = "";
+    }
+}