我需要从列表中删除项目

Question

我正在制作一个程序，它接受用户输入并将其填充到列表中。这部分工作很好。但是，用户需要编辑或删除他/她的输入的能力。我无法弄清楚如何从列表中删除一个项目。下面是填充列表代码：

[Serializable] 
class Recipient 
{ 
    public string Fname { get; set; } 
    public string MInit { get; set; } 
    public string Lname { get; set; } 
    public string Suffix { get; set; } 
    public string Amount { get; set; } 
    public string Message { get; set; } 
    public string Custom { get; set; } 
    public string CardType { get; set; } 
} protected void btnToCart_Click(object sender, EventArgs e) 
{ 
    if (ValidateInput("Card Information")) 
    { SetUI("Your Shopping Cart"); } 
    else 
    { 
     return; 
    } 

    Recipient recipients = new Recipient(); 

    List<string> FName = (List<string>)ViewState["recipientList"]; 
    List<string> MInit = (List<string>)ViewState["recipientList"]; 
    List<string> LName = (List<string>)ViewState["recipientList"]; 
    List<string> Suffix = (List<string>)ViewState["recipientList"]; 
    List<string> Amount = (List<string>)ViewState["recipientList"]; 
    List<string> Message = (List<string>)ViewState["recipientList"]; 
    List<string> Custom = (List<string>)ViewState["recipientList"]; 
    List<string> CardType = (List<string>)ViewState["recipientList"]; 

    if (FName == null && MInit == null && LName == null && Suffix == null && Amount == null && 
      Message == null && Custom == null && CardType == null) 
    { 
     FName = new List<string>(); 
     MInit = new List<string>(); 
     LName = new List<string>(); 
     Suffix = new List<string>(); 
     Amount = new List<string>(); 
     Message = new List<string>(); 
     Custom = new List<string>(); 
     CardType = new List<string>(); 
    } 

    recipients.Fname = txtFName.Text; 
    recipients.MInit = txtMInit.Text; 
    recipients.Lname = txtLName.Text; 
    recipients.Suffix = ddlSuffix1.SelectedItem.ToString(); 
    recipients.Amount = txtAmount.Text; 
    recipients.Message = ddlMessage.SelectedItem.ToString(); 
    recipients.Custom = txtCustom.Text; 
    recipients.CardType = lblImage.Text; 
    FName.Add(recipients.Fname); 
    MInit.Add(recipients.MInit); 
    LName.Add(recipients.Lname); 
    Suffix.Add(recipients.Suffix); 
    Amount.Add(recipients.Amount); 
    Message.Add(recipients.Message); 
    Custom.Add(recipients.Custom); 
    CardType.Add(recipients.CardType); 
    ViewState["recipientList"] = FName; 
    ViewState["recipientList"] = MInit; 
    ViewState["recipientList"] = LName; 
    ViewState["recipientList"] = Suffix; 
    ViewState["recipientList"] = Amount; 
    ViewState["recipientList"] = Message; 
    ViewState["recipientList"] = Custom; 
    ViewState["recipientList"] = CardType; 

    if (FName.Count == 1 && MInit.Count == 1 && LName.Count == 1 && Suffix.Count == 1) 
    { 
     lblCartName.Text = FName[0] + " " + MInit[0] + " " + LName[0] + " " + Suffix[0]; 
     lnkEdit1.Visible = true; 
    } 

    if (Amount.Count == 1 && Message.Count == 1 && Custom.Count == 1) 
    { 
     lblCartAmount.Text = "$" + Amount[0] + ".00"; 
     if (txtCustom.Text == string.Empty) 
     { 
      lblCartMessage.Text = Message[0]; 
     } 
     else 
     { 
      lblCartMessage.Text = Custom[0]; 
     } 
    } 

是有更多的，但不管怎么说，一旦用户点击下一步按钮然后进行了总结，显示与输入的所有信息的用户。表单上还有两个链接按钮，用户可以选择编辑或删除。我试过以下变体：

FName.Remove（recipients.fname）;和FName.RemoveAt（0）;例如，这些都没有奏效。所以这是我的问题，任何帮助将不胜感激。由于

Answer 1

像@ rich.okelly写下您覆盖你的浏览状态：通过调用'的ViewState [ “recipientList”] =嗒嗒

List<string> FName = (List<string>)ViewState["recipientListFName"]; 
List<string> MInit = (List<string>)ViewState["recipientListMInit"]; 
List<string> LName = (List<string>)ViewState["recipientListLName"]; 
List<string> Suffix = (List<string>)ViewState["recipientListSuffix"]; 
List<string> Amount = (List<string>)ViewState["recipientListAmount"]; 
List<string> Message = (List<string>)ViewState["recipientListMessage"]; 
List<string> Custom = (List<string>)ViewState["recipientListCustom"]; 
List<string> CardType = (List<string>)ViewState["recipientListCardType"];