LINQ to SQL無法插入數據庫

Question

我目前正在學習LINQ，現在我嘗試使用Linq向sql進行插入，但是在插入時遇到了挑戰，因為在調試時它顯示了不正確的字符串格式，但沒有指向特定的行。 您能在我犯錯的地方幫我嗎？

保存按鈕

List<LEGAL_MEMBER> _LegalMemberList = _dc.LEGAL_MEMBERs.Where(a => a.IDNumber == txtIDNumber.Text.ToString()).ToList();

if (rbtnAreYouEmployed.Items[0].Selected == true)
{
    ViewState["AreyouEmployed"] = true;
}
else
{
    ViewState["AreyouEmployed"] = false;
}

if (rbtnIsSACitizen.Items[0].Selected == true)
{
    ViewState["IsSACitizen"] = true;
}
else
{
    ViewState["IsSACitizen"] = false;
}
if (_LegalMemberList != null)
{
    if (_LegalMemberList.Count() == 0)
    {
        LEGAL_MEMBER _legalMember = new LEGAL_MEMBER
        {
            IDNumber = txtIDNumber.Text,
            InceptionDate = Convert.ToDateTime(txtInceptionDate.Text),
            LegalPreferedName = txtPreferedName.Text,
            Initials = txtInitials.Text,
            TitleID = int.Parse(cboTitle.SelectedValue),
            FullNames = txtFullNames.Text,
            Surname = txtSurname.Text,
            Age = int.Parse(txtAge.Text),
            DateOfBirth = Convert.ToDateTime(txtDateOfBirth.Text),
            PassportNumber = txtPassport.Text,
            AreyouEmployed = bool.Parse(ViewState["AreyouEmployed"].ToString()),
            Employer = txtEmployer.Text,
            ContactNumber = txtContactNumber.Text,
            OtherContanctNumber = txtOtherContanctNumber.Text,
            EmailAddress = txtEmailAddress.Text,
            IsSACitizen = bool.Parse(ViewState["IsSACitizen"].ToString()),
            TelephoneWork = txtTelephoneWork.Text,
            TelephoneHome = txtTelephoneHome.Text,
        };

        _dc.LEGAL_MEMBERs.InsertOnSubmit(_legalMember);
        _dc.SubmitChanges();

SQL表

CREATE TABLE [dbo].[LEGAL_MEMBER](
[LegalMembershipID] [int] IDENTITY(1,1) NOT NULL,
[InceptionDate] [datetime] NULL,
[LegalPreferedName] [nvarchar](50) NULL,
[Initials] [nvarchar](50) NULL,
[TitleID] [int] NULL,
[FullNames] [nvarchar](50) NULL,
[Surname] [nvarchar](50) NULL,
[Age] [int] NULL,
[DateOfBirth] [datetime] NULL,
[IDNumber] [nvarchar](50) NULL,
[PassportNumber] [nvarchar](50) NULL,
[AreyouEmployed] [bit] NULL,
[Employer] [nvarchar](50) NULL,
[ContactNumber] [nvarchar](50) NULL,
[OtherContanctNumber] [nvarchar](50) NULL,
[EmailAddress] [nvarchar](50) NULL,
[IsSACitizen] [bit] NULL,
[TelephoneWork] [nvarchar](50) NULL,
[TelephoneHome] [nvarchar](50) NULL)

Answer 1

這將是失敗的Parse方法之一。 您可以選擇一些調試方法：

1. 在行LEGAL_MEMBER _legalMember = new LEGAL_MEMBER上放置一個斷點，然后在VS的Immediate Window中嘗試所有單獨的Parse調用。

2. 逐一傳遞屬性值，然后查看失敗之處。

    LEGAL_MEMBER _legalMember = new LEGAL_MEMBER(); _legalMember.LegalMembershipID = int.Parse(txtMemberShipNumber.Text); _legalMember.InceptionDate = DateTime.Parse(txtInceptionDate.Text); _legalMember.LegalPreferedName = txtPreferedName.Text; _legalMember.Initials = txtInitials.Text; _legalMember.TitleID = int.Parse(cboTitle.SelectedValue); _legalMember.FullNames = txtFullNames.Text; _legalMember.Surname = txtSurname.Text; _legalMember.Age = int.Parse(txtAge.Text); _legalMember.DateOfBirth = int.Parse(txtDateOfBirth.Text); _legalMember.IDNumber = txtIDNumber.Text; _legalMember.PassportNumber = txtPassport.Text; _legalMember.AreyouEmployed = bool.Parse(ViewState["AreyouEmployed"].ToString()); _legalMember.Employer = txtEmployer.Text; _legalMember.ContactNumber = txtContactNumber.Text; _legalMember.OtherContanctNumber = txtOtherContanctNumber.Text; _legalMember.EmailAddress = txtEmailAddress.Text; _legalMember.IsSACitizen = bool.Parse(ViewState["IsSACitizen"].ToString()); _legalMember.TelephoneWork = txtTelephoneWork.Text; _legalMember.TelephoneHome = txtTelephoneHome.Text; 

Answer 2

由此很難確定，但是您給出的代碼中最明顯的問題是以下行：

DateOfBirth = int.Parse(txtDateOfBirth.Text)

我假設這將嘗試將類似於“ 09/21/2015”的字符串轉換為儒略日期或OADate日期？

如果是這樣，則需要將字符串轉換為日期時間，然后再轉換為整數。

要獲取日期時間，請嘗試

var dob = DateTime.Parse(txtDateOfBirth.Text);

然后獲得OADate使用

DateOfBirth = dob.ToOADate().

如果您需要儒略日期，請使用一個簡單的輔助函數，如下所示：

public static double ToJulianDate(this DateTime date)
{
    return date.ToOADate() + 2415018.5;
}

（摘自此答案 ）

InceptionDate = DateTime.Parse(txtInceptionDate.Text);也是如此InceptionDate = DateTime.Parse(txtInceptionDate.Text);

但是，如果您有選擇的話，一個更好的選擇是將這些日期作為DateTime列存儲在數據庫中。

Answer 3

我認為您不需要此行：刪除此行后嘗試插入：

       LegalMembershipID = int.Parse(txtMemberShipNumber.Text) 

因為您的主鍵字段是自動遞增。 請刪除它，然后嘗試插入。

Answer 4

我已經意識到我的復選框是引起問題的地方。 深潛之后，我設法修復了它。 以下是我的解決方案，並感謝所有幫助我的人。

            List<LEGAL_MEMBER> _LegalMemberList = _dc.LEGAL_MEMBERs.Where(a => a.IDNumber == txtIDNumber.Text.ToString()).ToList();

            if (rbtnAreYouEmployed.Items[0].Selected == true)
            {
                ViewState["AreyouEmployed"] = true;
            }
            else
            {
                ViewState["AreyouEmployed"] = false;
            }

            if (rbtnIsSACitizen.Items[0].Selected == true)
            {
                ViewState["IsSACitizen"] = true;
            }
            else
            {
                ViewState["IsSACitizen"] = false;
            }
            if (_LegalMemberList != null)
            {
                if (_LegalMemberList.Count() == 0)
                {
                    LEGAL_MEMBER _legalMember = new LEGAL_MEMBER
                    {
                        IDNumber = txtIDNumber.Text,
                        InceptionDate = Convert.ToDateTime(txtInceptionDate.Text),
                        LegalPreferedName = txtPreferedName.Text,
                        Initials = txtInitials.Text,
                        TitleID = int.Parse(cboTitle.SelectedValue),
                        FullNames = txtFullNames.Text,
                        Surname = txtSurname.Text,
                        Age = int.Parse(txtAge.Text),
                        DateOfBirth = Convert.ToDateTime(txtDateOfBirth.Text),
                        PassportNumber = txtPassport.Text,
                        AreyouEmployed = bool.Parse(ViewState["AreyouEmployed"].ToString()),
                        Employer = txtEmployer.Text,
                        ContactNumber = txtContactNumber.Text,
                        OtherContanctNumber = txtOtherContanctNumber.Text,
                        EmailAddress = txtEmailAddress.Text,
                        IsSACitizen = bool.Parse(ViewState["IsSACitizen"].ToString()),
                        TelephoneWork = txtTelephoneWork.Text,
                        TelephoneHome = txtTelephoneHome.Text,
                    };

                    _dc.LEGAL_MEMBERs.InsertOnSubmit(_legalMember);
                    _dc.SubmitChanges();