WPF中如何简单的使用MvvmLight创建一个项目并进行 增删改查
第一步：创建项目后下载如下两个NuGet程序包，然后删除删掉using Microsoft.Practices.ServiceLocation; 并且引入using CommonServiceLocator;
第二步：删除原来的XAML文件并创建如下的包结构然后创建一个在View文件夹中创建一个Main窗体 再将App.XAML中的StartupUri修改为View/Main.xaml
第三步：创建Model层中的文件UserInfo和Todo
UserInfo的类如下：
using GalaSoft.MvvmLight;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace WPF练习12简单的项目.Model
{
public class UserInfo : ObservableObject
{
[Key]
public int UserId { get; set; }
[Required(ErrorMessage = "账号必填")]
[Column(TypeName = "varchar(50)")]
public string Account { get; set; }
[Required(ErrorMessage = "密码必填")]
[Column(TypeName = "varchar(50)")]
public string Pwd { get; set; }
}
}
Todo的类如下：
using GalaSoft.MvvmLight;
using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace WPF练习12简单的项目.Model
{
public class Todo:ObservableObject
{
[Key]
public int TodoId { get; set; }
[Required(ErrorMessage = "任务标题必填")]
[Column(TypeName = "varchar(50)")]
public string Title { get; set; }
[Column(TypeName = "varchar(150)")]
public string Detail { get; set; }
[Required(ErrorMessage = "是否完成必填")]
[Column(TypeName = "bit")]
public bool IsCompleted { get; set; } = false;
[Required(ErrorMessage = "创建人Id必填")]
[Column(TypeName = "int")]
public int CreateUserId { get; set; }
[Required(ErrorMessage = "创建日期必填")]
[Column(TypeName = "datetime")]
public DateTime CreateTime { get; set; } = DateTime.Now;
}
}
第四步：创建Service层IUserInfoService接口和ITodoService接口
IUserInfoService接口如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WPF练习12简单的项目.Model;
namespace WPF练习12简单的项目.Service
{
public interface IUserInfoService
{
bool Add(UserInfo model);
bool Delete(int id);
bool Update(UserInfo model);
List<UserInfo> GetList(string strWhere);
List<UserInfo> GetListByPage(string strWhere, string orderBy, int startIndex, int endIndex);
UserInfo GetModel(int id);
}
}
ITodoService接口如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WPF练习12简单的项目.Model;
namespace WPF练习12简单的项目.Service
{
public interface ITodoService
{
bool Add(Todo model);
bool Delete(int id);
bool Update(Todo model);
List<Todo> GetList(string strWhere);
List<Todo> GetListByPage(string strWhere, string orderBy, int startIndex, int endIndex);
int GetCount(string strWhere);
Todo GetModel(int id);
}
}
第五步：配置连接字符串 并将连接的内容封装到Tool文件夹中的ConstHelper
ConstHelper类如下：
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WPF练习12简单的项目.Tool
{
public static class ConstHelper
{
public static string ConnectionString { get; } = ConfigurationManager.ConnectionStrings["connString"].ConnectionString;
}
}
第六步：在ServiceImpl文件夹实现Service层中的接口
UserInfoService类如下：
using Dapper;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WPF练习12简单的项目.Model;
using WPF练习12简单的项目.Service;
using WPF练习12简单的项目.Tool;
namespace WPF练习12简单的项目.ServiceImpl
{
public class UserInfoService:IUserInfoService
{
public bool Add(UserInfo model)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "INSERT INTO UserInfo(Account, Pwd) VALUES (@Account, @Pwd)";
return conn.Execute(sql, model) > 0;
}
}
public bool Delete(int id)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "DELETE FROM UserInfo WHERE UserId=@UserId";
var paramter = new { UserId = id };
return conn.Execute(sql, paramter) > 0;
}
}
public List<UserInfo> GetList(string strWhere)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "SELECT UserId, Account, Pwd FROM UserInfo WHERE 1=1 ";
if (!string.IsNullOrEmpty(strWhere)) sql += $" AND {strWhere}";
return conn.Query<UserInfo>(sql).ToList();
}
}
public List<UserInfo> GetListByPage(string strWhere, string orderBy, int startIndex, int endIndex)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
StringBuilder sql = new StringBuilder();
sql.Append("SELECT * FROM ( ");
sql.Append(" SELECT ROW_NUMBER() OVER (");
if (!string.IsNullOrEmpty(orderBy.Trim()))
sql.Append("ORDER BY T." + orderBy);
else
sql.Append("ORDER BY T.UserId DESC");
sql.Append(")AS Row, T.* FROM [User] T ");
if (!string.IsNullOrEmpty(strWhere.Trim()))
{
sql.Append(" WHERE " + strWhere);
}
sql.Append(" ) TT");
sql.AppendFormat(" WHERE TT.Row BETWEEN {0} AND {1}", startIndex, endIndex);
return conn.Query<UserInfo>(sql.ToString()).ToList();
}
}
public UserInfo GetModel(int id)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "SELECT UserId, Account, Pwd FROM UserInfo WHERE UserId=@UserId";
var parameter = new { UserId = id };
return conn.QueryFirstOrDefault<UserInfo>(sql, parameter);
}
}
public bool Update(UserInfo model)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "UPDATE UserInfo SET Account=@Account, Pwd=@Pwd WHERE UserId=@UserId";
return conn.Execute(sql, model) > 0;
}
}
}
}
TodoService类如下：
using Dapper;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WPF练习12简单的项目.Model;
using WPF练习12简单的项目.Service;
using WPF练习12简单的项目.Tool;
namespace WPF练习12简单的项目.ServiceImpl
{
public class TodoService : ITodoService
{
public bool Add(Todo model)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "INSERT INTO [Todo](Title, Detail, IsCompleted, CreateUserId, CreateTime) VALUES (@Title, @Detail, @IsCompleted, @CreateUserId, @CreateTime)";
return conn.Execute(sql, model) > 0;
}
}
public bool Delete(int id)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "DELETE FROM [Todo] WHERE TodoId=@TodoId";
var paramter = new { TodoId = id };
return conn.Execute(sql, paramter) > 0;
}
}
public List<Todo> GetList(string strWhere)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "SELECT TodoId, Title, Detail, IsCompleted, CreateUserId, CreateUserName, CreateTime FROM [TodoView] WHERE 1=1 ";
if (!string.IsNullOrEmpty(strWhere)) sql += $" AND {strWhere}";
return conn.Query<Todo>(sql).ToList();
}
}
public List<Todo> GetListByPage(string strWhere, string orderBy, int startIndex, int endIndex)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
StringBuilder sql = new StringBuilder();
sql.Append("SELECT * FROM ( ");
sql.Append(" SELECT ROW_NUMBER() OVER (");
if (!string.IsNullOrEmpty(orderBy.Trim()))
sql.Append("ORDER BY T." + orderBy);
else
sql.Append("ORDER BY T.TodoId DESC");
sql.Append(")AS Row, T.* FROM [TodoView] T ");
if (!string.IsNullOrEmpty(strWhere.Trim()))
{
sql.Append(" WHERE " + strWhere);
}
sql.Append(" ) TT");
sql.AppendFormat(" WHERE TT.Row BETWEEN {0} AND {1}", startIndex, endIndex);
return conn.Query<Todo>(sql.ToString()).ToList();
}
}
public int GetCount(string strWhere)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "SELECT COUNT(TodoId) FROM [Todo] WHERE 1=1 ";
if (!string.IsNullOrEmpty(strWhere)) sql += $" AND {strWhere}";
return conn.ExecuteScalar<int>(sql);
}
}
public Model.Todo GetModel(int id)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "SELECT TodoId, Title, Detail, IsCompleted, CreateUserId, CreateTime FROM [Todo] WHERE TodoId=@TodoId";
var parameter = new { TodoId = id };
return conn.QueryFirstOrDefault<Model.Todo>(sql, parameter);
}
}
public bool Update(Model.Todo model)
{
using (var conn = new SqlConnection(ConstHelper.ConnectionString))
{
conn.Open();
var sql = "UPDATE [Todo] SET Title=@Title, Detail=@Detail, IsCompleted=@IsCompleted, CreateUserId=@CreateUserId, CreateTime=@CreateTime WHERE TodoId=@TodoId";
return conn.Execute(sql, model) > 0;
}
}
}
}
第七步：在View文件夹中创建Login.XAML文件 并将App.XAML文件进行修改
1.将StartupUri删除
2.添加 ShutdownMode="OnExplicitShutdown"和Startup="Application_Startup"
原文地址：https://blog.csdn.net/weixin_64532720/article/details/143492132
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