如果您已经创建了一个Custom对象列表,那么在添加之前,想要检查该列表以查看其是否包含对象,是否必须与Hashcodes关联?有没有一种更简单的方法,基本上我想在自定义对象列表上使用contains方法,以查看要添加的对象是否已存在于列表中,是否有一种更简单的方法来处理哈希码?这是我的代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DataConverter.Objects;
namespace DataConverter.Converters
{
class CategoryConverter
{
private Category category;
private SubCategory subCategory;
private ExcellObj excellObj;
public CategoryConverter(string path)
{
excellObj = new ExcellObj(path);
}
public List<Category> getCategoryListExcel()
{
List<Category> categories = new List<Category>();
List<string> ColumnNames = new List<string> { "Group1", "Group1Descr" };
List<int> CorrectColumn = new List<int>();
for(int i = 0; i < ColumnNames.Count; i++)
{
CorrectColumn.Add(excellObj.findColumn(ColumnNames[i]));
}
for(int i = 2; i < excellObj.allRows; i++)
{
categories.Add(category = new Category(excellObj.getValuesFromCell(i, CorrectColumn[1]), excellObj.getValuesFromCell(i, CorrectColumn[0]), "Home"));
}
return categories;
}
public List<List<SubCategory>> getSubCategory()
{
List<SubCategory> subCategories1 = new List<SubCategory>();
List<SubCategory> subCategories2 = new List<SubCategory>();
List<List<SubCategory>> subCategoriesList = new List<List<SubCategory>>();
List<string> ColumnNamesSubCategory1 = new List<string> { "Group2", "Group2Descr" };
List<string> ColumnNamesSubCategory2 = new List<string> { "Group3", "Group3Desc" };
List<int> CorrectColumn1 = new List<int>();
List<int> CorrectColumn2 = new List<int>();
for(int i = 0; i < ColumnNamesSubCategory1.Count; i++)
{
CorrectColumn1.Add(excellObj.findColumn(ColumnNamesSubCategory1[i]));
CorrectColumn2.Add(excellObj.findColumn(ColumnNamesSubCategory2[i]));
}
for(int i = 1; i < excellObj.allRows; i++)
{
subCategories1.Add(subCategory = new SubCategory(excellObj.getValuesFromCell(i, CorrectColumn1[1]),excellObj.getValuesFromCell(i,CorrectColumn1[0]), "Home"));
subCategories2.Add(subCategory = new SubCategory(excellObj.getValuesFromCell(i,CorrectColumn2[1]), excellObj.getValuesFromCell(i,CorrectColumn2[0]), "Home"));
}
subCategoriesList.Add(subCategories1);
subCategoriesList.Add(subCategories2);
return subCategoriesList;
}
public void finnishedUsingExcel()
{
excellObj.CloseApplication();
}
}
}
[我想发生的事情是我想经营一辆
if(categories.Contains(category) == false){
categories.add(category)
}
假设您有这样的代码:
如果合理的话,您确实应该让您的类实现IEquatable,并且您将以任何频率检查是否相等,只是为了确保它不会咬您。 “包含”方法将起作用,但仅用于测试是否存在exact