Question

我的主要目标是比较存储在DB和XLSX文件中的数据。

为此，我按照以下方式创建了两个列表：

private class ProductList
{
    public string productSku { get; set; }
    public string productName { get; set; }
    public string productSubfamilyId { get; set; }
    public string productSubfamilyName { get; set; }
    public string productFamilyId { get; set; }
    public string productFamilyName { get; set; }
};

(...)
List<ProductList> productListsDB = new List<ProductList>();
List<ProductList> productListsXLSX = new List<ProductList>();
(...)

首先，我直接从SQL查询结果提供数据：

while (reader.Read())
{
    ProductList pl = new ProductList();
    pl.productSku = reader.GetString(reader.GetOrdinal("ProductSku"));
    pl.productName = reader.GetString(reader.GetOrdinal("ProductName"));
    pl.productSubfamilyId = reader.GetString(reader.GetOrdinal("ProductSubfamilyId"));
    pl.productSubfamilyName = reader.GetString(reader.GetOrdinal("ProductSubfamilyName"));
    pl.productFamilyId = reader.GetString(reader.GetOrdinal("ProductFamilyId"));
    pl.productFamilyName = reader.GetString(reader.GetOrdinal("ProductFamilyName"));
    productListsDB.Add(pl);
}

另一个充满了存储在XLSX文件中的数据：

for (int rowNum = startingRow; rowNum <= totalRows; rowNum++)
{
    var row = myWorksheet.Cells[rowNum, 1, rowNum, totalColumns].ToArray();

    ProductList pl = new ProductList();
    pl.productSku = (string)row[0].Value;
    pl.productName = (string)row[1].Value;
    pl.productSubfamilyId = (string)row[2].Value;
    pl.productSubfamilyName = (string)row[3].Value;
    pl.productFamilyId = (string)row[4].Value;
    pl.productFamilyName = (string)row[5].Value;
    productListsXLSX.Add(pl);
}

然后我想比较它们：

Assert.IsTrue(Equals(productListsDB.Count,productListsXLSX.Count), "Number of records in Excel file and DB differs!");

通过就好了！

但以下两个中的任何一个都没有通过：

Assert.IsTrue(productListsDB.All(productListsXLSX.Contains), "Data sent in Excel file and stored in DB are equal.");
CollectionAssert.AreEquivalent(productListsDB, productListsXLSX, "Data sent in Excel file and stored in DB are equal.");

我是编写和调试代码的新手，但我设法通过VS中的QuickWatch获得了该列表的一些见解。 我将数据复制到单独的文件并对其进行了编辑 - 它们是相同的：

http://pastebin.com/KFDHpQkC 和 http://pastebin.com/4j1n1nPH

任何线索的家伙？

Answer 1

您需要覆盖Equals来判断这两种产品是否相同。通常，当我们覆盖Equals时，我们也会覆盖GetHashCode：Why is it important to override GetHashCode when Equals method is overridden?

private class ProductList
{
    public string productSku { get; set; }
    public string productName { get; set; }
    public string productSubfamilyId { get; set; }
    public string productSubfamilyName { get; set; }
    public string productFamilyId { get; set; }
    public string productFamilyName { get; set; }

    public override bool Equals(object otherProduct)
    {
        //your code goes here to tell when the 2 products are equivalent.
        //Here I assume that your 2 products are equal when all the properties are equal:
        if (otherProduct == null)
           return false;
        return this.productSku == otherProduct.productSku &&
               this.productName == otherProduct.productName &&
               this.productSubfamilyId == otherProduct.productSubfamilyId &&
               this.productSubfamilyName == otherProduct.productSubfamilyName &&
               this.productFamilyId == otherProduct.productFamilyId &&
               this.productFamilyName == otherProduct.productFamilyName;
    }

    public override int GetHashCode()
    {
         //return your hash code
         int hash = 13;
         hash = (hash * 7) + this.productSku.GetHashCode();
         hash = (hash * 7) + this.productName.GetHashCode();
         ...
         return hash;
    }
};

Answer 2

您必须覆盖Equals和GetHashCode方法。 Equals方法将第一个对象的属性与另一个对象属性进行比较。

为什么列表比较失败，如果列表（似乎）相同

2 个答案: