如何更新列表框中的实体框架行

本文介绍了如何更新列表框中的实体框架行的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

Hello Guys正在处理一个项目，我正面临一个问题，如果我在列表框中添加项目，所以项目添加成功，现在我想如果我添加相同的项目两次，所以它不添加2次它添加1次，但它显示数量与多重复制金额。

i使用此代码在列表框中添加项目

Hello Guys am working on a project an i am facing a problem if i am adding a item in listbox so items add successfully and now i want if i add same items two times so its not add 2 times it's add 1 times but it's show quantity with mulitplication amount.

i am using this code for adding items in listbox

Button b = (Button)sender;
                 tblProduct tp2 = (tblProduct)b.Tag;
                 string product2 = tp2.productName;
                 listBox2.Text = tp2.ToString();
                 products2.Add(tp2);
                 total2 += (decimal)tp2.productPrice;

请看这个图片：

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我尝试过：

int Qlty = +1;

string ProductName =（（tblProduct）e.ListItem）.productName;

string Price =Rs：+ String.Format（{0：}，（（tblProduct）e.ListItem）.productPrice） ;

string ProductNamePadded = ProductName.PadRight（33）;

e.Value = ProductNamePadded + Qlty + Price;

Please look at this image:
Imgur: The most awesome images on the Internet[^]

What I have tried:

int Qlty = +1;
string ProductName = ((tblProduct)e.ListItem).productName;
string Price = "Rs: " + String.Format("{0:}", ((tblProduct)e.ListItem).productPrice);
string ProductNamePadded = ProductName.PadRight(33);
e.Value = ProductNamePadded+Qlty+Price;

推荐答案

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
	public void Main()
	{
		// Simulate order
		Order order = new Order
		{
			TableNumber = "Table 1",
			Products = new List<Product>
			{
				new Product { Name = "Item 1", Price = 100.00m, Quantity = 3},
				new Product { Name = "Item 2", Price = 89.00m, Quantity = 2},
				new Product { Name = "Item 3", Price = 50.00m, Quantity = 1 }
			}
		};
		
		
		foreach(var p in order.Products)
		{
			Console.WriteLine(p.Name + " (Each: " + p.Price + ")" + " - Qty: " + p.Quantity + " (" + p.Total() + ")");
		}
	}
}

public class Order
{
	public List<Product> Products { get; set; }

	public string TableNumber{get;set;}
	
	public decimal Total()
	{
		if (Products.Any())
			return Products.Sum(x => x.Price);
		return 0.00m;
	}

	public Order()
	{
		Products = new List<Product>();
	}
	
	public void RemoveProduct()
	{
		// Implement here remove logic
	}
	
	public bool IsAdded(string productName)
	{
		return Products.Any(x=>x.Name.ToLower() == productName.ToLower());
	}
}

public class Product
{
	public string Name { get; set; }
	public decimal Price { get; set; }
	public int Quantity { get; set; }
	
	public decimal Total()
	{
		return Price * Quantity;
	}
}

这篇关于如何更新列表框中的实体框架行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

productname