Question

我目前正在学习LINQ，现在我正在尝试使用Linq插入sql但插入时遇到了挑战，因为它在我调试时向我显示不正确的字符串格式，但它没有指向特定的行。你能在我犯错的地方帮助我。

保存按钮

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

这将是失败的Parse方法之一。您有一些选项可以调试它：

在LEGAL_MEMBER _legalMember = new LEGAL_MEMBER行上设置一个断点，然后在VS中的Parse中尝试所有单独的Immediate Window来电。

逐个传递属性值并查看失败的位置。

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

很难确定这一点，但您所提供的代码中最明显的问题是这一行：

DateOfBirth = int.Parse(txtDateOfBirth.Text)

我认为这将尝试转换类似于＆＃34; 09/21/2015＆＃34;像Julian或OADate这样的日期？

如果是这样，您需要将字符串转换为日期时间，然后再转换为整数。

要获取日期时间，请尝试

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

然后使用OADate

DateOfBirth = dob.ToOADate().

如果您需要Julian日期，请使用如下的简单帮助函数：

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

（摘自this answer）

InceptionDate = DateTime.Parse(txtInceptionDate.Text);

也是如此

如果你有选择，那么更好的选择是将这些日期存储为数据库中的DateTime列。

Answer 3

我认为你不需要这一行：在删除这一行后尝试插入：

       LegalMembershipID = int.Parse(txtMemberShipNumber.Text)

因为您的主键字段是自动增量。请删除它，然后尝试插入。

Answer 4

我已经意识到我的复选框导致了问题。深度潜水后，我设法解决了这个问题。以下是我的解决方案，感谢所有帮助过我的人。

            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();

LINQ to SQL无法插入数据库

4 个答案: