将类的对象添加到同一类C#的数组中答案

【问题标题】：Adding an Object of class to an array of the same class C#将类的对象添加到同一类C#的数组中
【发布时间】：2020-12-15 04:59:13
【问题描述】：

大家好 我尝试将一组ٍStrings转换为一个类，然后将这些元素添加到同一类的数组或列表中

问题 一切都很好，只有添加一个元素时，它才会将数组中的所有值更改为与最后一个元素相同的值

TxtCookie.Text：

此代码：

        //Get The Value from Text Box To list of Strings
        string[] lst = TxtCookie.Text.Split(',');
        //Divide each element into a set of values
        var D = (from a in lst select a.Split('|')).ToList();

        //Define an object from the class
        TblInvoiceContent tblInvoiceContent = new TblInvoiceContent();
        //Define an List from the class
        List<TblInvoiceContent> TBLIC = new List<TblInvoiceContent>();

        //Here I take the values and configure them according to the class structure
        foreach (var item in D)
        {
            tblInvoiceContent.ItremID = Convert.ToInt32(item[1]);
            tblInvoiceContent.SilingPrice = Convert.ToDouble(item[2]);
            tblInvoiceContent.Quantity = Convert.ToInt32(item[3]);
            tblInvoiceContent.mayonnaise = Convert.ToBoolean(item[4]);
            tblInvoiceContent.ketchup = Convert.ToBoolean(item[5]);
            tblInvoiceContent.Hot = Convert.ToBoolean(item[6]);
            tblInvoiceContent.garlic = Convert.ToBoolean(item[7]);
            tblInvoiceContent.Reqomindition = item[8].ToString();
            //Here I add the item to the list
            TBLIC.Add(tblInvoiceContent);

        }
        //Here I am displaying the list items
        GridView1.DataSource = TBLIC;
        GridView1.DataBind();

结果：

【问题讨论】：

标签： c# entity-framework for-loop arraylist foreach

【解决方案1】：

因为您只创建了一个对象实例：

TblInvoiceContent tblInvoiceContent = new TblInvoiceContent();

然后在循环中您每次修改实例并再次将其重新添加到列表中。

将实例创建移动到循环中：

foreach (var item in D)
{
    TblInvoiceContent tblInvoiceContent = new TblInvoiceContent();

    tblInvoiceContent.ItremID = Convert.ToInt32(item[1]);
    tblInvoiceContent.SilingPrice = Convert.ToDouble(item[2]);
    tblInvoiceContent.Quantity = Convert.ToInt32(item[3]);
    tblInvoiceContent.mayonnaise = Convert.ToBoolean(item[4]);
    tblInvoiceContent.ketchup = Convert.ToBoolean(item[5]);
    tblInvoiceContent.Hot = Convert.ToBoolean(item[6]);
    tblInvoiceContent.garlic = Convert.ToBoolean(item[7]);
    tblInvoiceContent.Reqomindition = item[8].ToString();

    TBLIC.Add(tblInvoiceContent);
}

这样每次循环迭代你都会创建一个新的对象实例。

【讨论】：

【解决方案2】：

    //Get The Value from Text Box To list of Strings
    string[] lst = TxtCookie.Text.Split(',');
    //Divide each element into a set of values
    var D = (from a in lst select a.Split('|')).ToList();


    //Define an List from the class
    List<TblInvoiceContent> TBLIC = new List<TblInvoiceContent>();

    //Here I take the values and configure them according to the class structure
    foreach (var item in D)
    {
        //CALL IT HERE Define an object from the class
        TblInvoiceContent tblInvoiceContent = new TblInvoiceContent();

        tblInvoiceContent.ItremID = Convert.ToInt32(item[1]);
        tblInvoiceContent.SilingPrice = Convert.ToDouble(item[2]);
        tblInvoiceContent.Quantity = Convert.ToInt32(item[3]);
        tblInvoiceContent.mayonnaise = Convert.ToBoolean(item[4]);
        tblInvoiceContent.ketchup = Convert.ToBoolean(item[5]);
        tblInvoiceContent.Hot = Convert.ToBoolean(item[6]);
        tblInvoiceContent.garlic = Convert.ToBoolean(item[7]);
        tblInvoiceContent.Reqomindition = item[8].ToString();
        //Here I add the item to the list
        TBLIC.Add(tblInvoiceContent);

    }
    //Here I am displaying the list items
    GridView1.DataSource = TBLIC;
    GridView1.DataBind();

【讨论】：