C＃顯示錶中的某些行

Question

我在數據庫中有2個表。一個是用戶，另一個是社團。類似這樣的：

Users table:    Societies table: 
ID User Pass   ID UserID Societies 
1 Mark 123    1  1  Pepsi 
2 John abc    2  1  Lays 
3 Paul a1b    3  2  Unilever 
          4  3  Nestle 

UserID有一個來自Users表的ID的外鍵。

和2種形式：用戶的登錄面板和顯示在Datagridview社團中的登錄面板。

現在，我試圖弄清楚，當我與用戶登錄時，只顯示具有該用戶的特定用戶ID的社團。

我在第二個表格中顯示了這個方法來顯示特定的社團，但是我不知道要在等號括號內放置什麼。我嘗試了很多可能性，但沒有任何工作...

private void btnLoad_Click(object sender, EventArgs e) 
{ 
    DCApp db = DCApp.NewDC(); 

    User logedUser = db.Users.FirstOrDefault(s => s == Program._us); 

    List<Society> ListSociety = db.Societies.Where(s => s.UserID.Equals(logedUser)).ToList(); 

    _bs.DataSource = ListSociety; 
    dgwUser.DataSource = _bs; 
    dgwUser.Refresh(); 
    _bs.ResetBindings(false);  
} 

如果您有一些提示，請給我一個路徑。我的代碼

休息：

的Program.cs

using System; 
using System.Windows.Forms; 

namespace Users 
{ 
static class Program 
{ 
    public static User _us; 
    [STAThread] 
    static void Main() 
    { 
    Application.EnableVisualStyles(); 
    Application.SetCompatibleTextRenderingDefault(false); 
    frmLogin f = new frmLogin(); 
    if (f.Run(out _us)) 
    { 
    Application.Run(new frmUsers()); 
    } 
    else 
    { 
    Application.Exit(); 
    } 
    } 
} 
} 

frmLogin.cs

namespace Users 
{ 
public partial class frmLogin : Form 
{ 
    bool _Result = false; 
    User _user; 

    public frmLogin() 
    { 
    InitializeComponent(); 
    } 
    internal bool Run(out User us) 
    { 
    us = _user; 
    ShowDialog(); 
    return _Result; 
    } 

    private void btnLogin_Click(object sender, EventArgs e) 
    { 
    if (cmdPassword.Text.Length == 0 || cmdUser.Text.Length == 0) 
    { 
    errH.SetError(btnLogin, "!"); 
    return; 
    } 
    using (DCApp db = DCApp.NewDC()) 
    { 
    List<User> logInP = db.Users.Where(s => s.UserPassword.ToLower().Equals(cmdPassword.Text.ToLower().Trim()) && s.UserName.ToLower().Equals(cmdUser.Text.ToLower())).ToList(); 
    if (logInP.Count == 0) 
    { 
    _Result = false; 
    } 
    else if (logInP.Count > 1) 
    { 
    _Result = false; 
    } 
    else 
    { 
    _Result = (bool) logInP.FirstOrDefault().IsActive; 
    _user = logInP.First(); 
    } 
    } 
    Close(); 
    } 

    private void btnCancel_Click(object sender, EventArgs e) 
    { 
    Application.Exit(); 
    } 
} 
} 

frmUsers.cs

using System; 
using System.Collections.Generic; 
using System.Data; 
using System.Linq; 
using System.Windows.Forms; 

namespace Users 
{ 
public partial class frmUsers : Form 
{ 
    BindingSource _bs = new BindingSource(); 

    public frmUsers() 
    { 
    InitializeComponent(); 
    InitControls(); 
    } 
    private void InitControls() 
    { 
    dgwUser.AutoGenerateColumns = false; 
    } 
    private void btnLoad_Click(object sender, EventArgs e) 
    { 
    DCApp db = DCApp.NewDC(); 

    User logedUser = db.Users.FirstOrDefault(s => s == Program._us); 

    List<Society> ListSociety = db.Societies.Where(s => s.UserID.Equals(logedUser)).ToList(); 

    _bs.DataSource = ListSociety; 
    dgwUser.DataSource = _bs; 
    dgwUser.Refresh(); 
    _bs.ResetBindings(false);  
    } 
} 
} 

Answer 1

我解決了這個問題！這是我做過什麼：

在frmLogin.cs

... 
    internal bool Run(out User user) 
    {  
    ShowDialog(); 
    user = _user; 
    return _Result; 
    } 
... 

而且在frmUsers.cs

private void btnLoad_Click(object sender, EventArgs e) 
    { 
    DCApp db = DCApp.NewDC(); 

    User logedUser = db.Users.FirstOrDefault(s => s == Program._user); 

    List<Society> ListSociety = db.Societies.Where(s => s.UserID == logedUser.ID).ToList(); 

    _bindingSource.DataSource = ListSociety; 
    dgwUser.DataSource = _bindingSource; 
    dgwUser.Refresh(); 
    _bindingSource.ResetBindings(false);  
    } 

謝謝大家的意見！

Answer 2

您正在使用asp.net成員資格供應商？如果是的話那麼你可以使用波紋管代碼來獲取ID：

MembershipUser user = Membership.GetUser(); 
string id = user.ProviderUserKey.ToString(); 

Answer 3

我認爲問題是dgwUser.AutoGenerateColumns = false;

要麼

private void InitControls() 
    { 
    dgwUser.AutoGenerateColumns = true; 
    } 

或者

private void AddColumns() 
    { 

     var col1 = new DataGridViewTextBoxColumn(); 
     var col2 = new DataGridViewCheckBoxColumn(); 
     var col3 = new DataGridViewCheckBoxColumn(); 

     col1.HeaderText = "YourHeaderText"; 
     col1.Name = "ID"; 

     col2.HeaderText = "YourHeaderText"; 
     col2.Name = "UserID"; 

     col3.HeaderText = "YourHeaderText"; 
     col3.Name = "Socities"; 

     dgwUser.Columns.AddRange(new DataGridViewColumn[] {col1,col2,col3}); 
    } 




    ... 
     List<Society> ListSociety = db.Societies.Where(s => s.UserID.Equals(logedUser.ID)).ToList(); 
     _bs.DataSource = ListSociety; 
     dgwUser.DataSource = _bs; 
     AddColumns(); 
     dgwUser.Refresh(); 
     _bs.ResetBindings(false); 
     ...