C＃--DataGridView - 無法獲取ColumnCount，無法獲取單元格值

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根據DGV的使用方式，我無法使用數據綁定。我會發布一切正在完成的事情，幾乎是我試圖做的事情。問題是，當我嘗試點擊SAVE時，該方法就好像不知道這個「dataGridView1」字符是誰，就好像它超出了範圍，但它沒有超出範圍。C＃--DataGridView - 無法獲取ColumnCount，無法獲取單元格值

private void RefreshDGV1(){ 
     dataGridView1.DataSource = null; 
     dataGridView1.Columns.Clear(); 
     dataGridView1.Rows.Clear(); 
     string query = (@" 
SELECT HLD_ID  AS 'HLD_ID'    , 
    HoldName AS 'Hold Name'   , 
    BeginDate AS 'Begin Date'   , 
    FileNumber AS 'File Number'  , 
    Operation AS 'Operation'   , 
    Brand  AS 'Brand'    , 
    PAddress AS 'Property Address' , 
    Found  AS 'Found'    , 
    Match  AS 'Address Match'  , 
    Secured  AS 'File Secured'  , 
    Relocated AS 'File Relocated'  , 
    Comment  AS 'Comment' 
FROM Records  
"); 
     //dataGridView1.DataSource  = bindingSource1; 
     //dataGridView1.ColumnCount  = 11; 

     //dataGridView1.Columns[0].Name = "Hold Name"; 
     DataGridViewTextBoxColumn HoldName = new DataGridViewTextBoxColumn(); 
     HoldName.HeaderText    = "Hold Name"; 
     HoldName.Name      = "Hold Name"; 
     HoldName.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(HoldName); 

     //dataGridView1.Columns[1].Name  = "Begin Date"; 
     DataGridViewTextBoxColumn BeginDate = new DataGridViewTextBoxColumn(); 
     BeginDate.HeaderText    = "Begin Date"; 
     BeginDate.Name      = "Begin Date"; 
     BeginDate.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(BeginDate); 

     //dataGridView1.Columns[2].Name  = "File Number"; 
     DataGridViewTextBoxColumn FileNumber = new DataGridViewTextBoxColumn(); 
     FileNumber.HeaderText    = "File Number"; 
     FileNumber.Name      = "File Number"; 
     FileNumber.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(FileNumber); 

     //dataGridView1.Columns[3].Name  = "Operation"; 
     DataGridViewTextBoxColumn Operation = new DataGridViewTextBoxColumn(); 
     Operation.HeaderText    = "Operation"; 
     Operation.Name      = "Operation"; 
     Operation.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(Operation); 

     //dataGridView1.Columns[4].Name = "Brand"; 
     DataGridViewTextBoxColumn Brand = new DataGridViewTextBoxColumn(); 
     Brand.HeaderText    = "Brand"; 
     Brand.Name      = "Brand"; 
     Brand.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(Brand); 

     //dataGridView1.Columns[5].Name   = "Property Address"; 
     DataGridViewTextBoxColumn PropertyAddress = new DataGridViewTextBoxColumn(); 
     PropertyAddress.HeaderText    = "Property Address"; 
     PropertyAddress.Name      = "PropertyAddress"; 
     PropertyAddress.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(PropertyAddress); 

     //dataGridView1.Columns[6].Name = "Found"; 
     DataGridViewComboBoxColumn Found = new DataGridViewComboBoxColumn(); 
     Found.HeaderText     = "Found"; 
     Found.Name      = "Found"; 
     Found.Items.Add(""); 
     Found.Items.Add("Found"); 
     Found.Items.Add("Not Found"); 
     Found.Items.Add("In Progress"); 
     Found.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(Found); 

     //dataGridView1.Columns[7].Name   = "Address Match"; 
     DataGridViewComboBoxColumn AddressMatch = new DataGridViewComboBoxColumn(); 
     AddressMatch.HeaderText     = "Address Match"; 
     AddressMatch.Name      = "Address Match"; 
     AddressMatch.Items.Add(""); 
     AddressMatch.Items.Add("Yes"); 
     AddressMatch.Items.Add("No"); 
     AddressMatch.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(AddressMatch); 

     //dataGridView1.Columns[8].Name  = "File Secured"; 
     DataGridViewCheckBoxColumn FileSecured = new DataGridViewCheckBoxColumn(); 
     FileSecured.HeaderText     = "File Secured"; 
     FileSecured.Name      = "File Secured"; 
     FileSecured.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(FileSecured); 

     //dataGridView1.Columns[9].Name   = "File Relocated"; 
     DataGridViewTextBoxColumn FileRelocated = new DataGridViewTextBoxColumn(); 
     FileRelocated.HeaderText    = "File Relocated"; 
     FileRelocated.Name      = "File Relocated"; 
     FileRelocated.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     dataGridView1.Columns.Add(FileRelocated); 

     //dataGridView1.Columns[10].Name = "Comment"; 
     DataGridViewTextBoxColumn Comment = new DataGridViewTextBoxColumn(); 
     Comment.HeaderText    = "Comment"; 
     Comment.Name      = "Comment"; 
     Comment.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill; 
     Comment.Width = (dataGridView1.Width/11); 
     dataGridView1.Columns.Add(Comment); 

     //dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill; 

     //other stuff 
     //dataGridView1.Columns[(dataGridView1.ColumnCount-1)].AutoSizeMode    = DataGridViewAutoSizeColumnMode.DisplayedCells; 
     dataGridView1.Columns[(dataGridView1.ColumnCount-1)].DefaultCellStyle.WrapMode = DataGridViewTriState.True; 
     dataGridView1.CellValueChanged += handler_dataGridView1_CellValueChanged; 
     ReadSQL(query, dataGridView1); 
    } 
private void ReadSQL(string query, DataGridView grid){ 
     try{ 
      string connectionString = "Server=SERVERNAME;Database=DATABASENAME;Persist Security Info=True;User ID=USERNAME;Password=PASSWORD"; 
      dataAdapter = new SqlDataAdapter(query, connectionString); 
      SqlCommandBuilder commandBuilder = new SqlCommandBuilder(dataAdapter); 
      DataTable table = new DataTable(); 
      table.Locale = System.Globalization.CultureInfo.InvariantCulture; 
      dataAdapter.Fill(table); 
      for(int i = 0 ; i < table.Rows.Count; i++){ 
       int n = grid.Rows.Add(); 
       grid.ColumnCount = 11; 
       InitializeComponent(); 

       //Add to ID array (list) 
       RecordIDs.Add(table.Rows[i].ItemArray[0].ToString()); 

       grid.Rows[n].Cells[0].Value = table.Rows[i].ItemArray[1].ToString(); 
       grid.Rows[n].Cells[1].Value = table.Rows[i].ItemArray[2].ToString(); 
       grid.Rows[n].Cells[2].Value = table.Rows[i].ItemArray[3].ToString(); 
       grid.Rows[n].Cells[3].Value = table.Rows[i].ItemArray[4].ToString(); 
       grid.Rows[n].Cells[4].Value = table.Rows[i].ItemArray[5].ToString(); 
       grid.Rows[n].Cells[5].Value = table.Rows[i].ItemArray[6].ToString(); 

       string selection1       = table.Rows[i].ItemArray[7].ToString(); 
       switch(selection1){ 
        case "Found"  : try{grid.Rows[n].Cells[6].Value = (grid.Rows[i].Cells[6] as DataGridViewComboBoxCell).Items[1];}catch{}; break; 
        case "Not Found" : try{grid.Rows[n].Cells[6].Value = (grid.Rows[i].Cells[6] as DataGridViewComboBoxCell).Items[2];}catch{}; break; 
        case "In Progress" : try{grid.Rows[n].Cells[6].Value = (grid.Rows[i].Cells[6] as DataGridViewComboBoxCell).Items[3];}catch{}; break; 
        default   : try{grid.Rows[n].Cells[6].Value = (grid.Rows[i].Cells[6] as DataGridViewComboBoxCell).Items[0];}catch{}; break; 
       } 

       string selection2 = table.Rows[i].ItemArray[8].ToString(); 
       switch(selection2){ 
        case "Yes" : try{grid.Rows[n].Cells[7].Value = (grid.Rows[i].Cells[7] as DataGridViewComboBoxCell).Items[1];}catch{}; break; 
        case "No" : try{grid.Rows[n].Cells[7].Value = (grid.Rows[i].Cells[7] as DataGridViewComboBoxCell).Items[2];}catch{}; break; 
        default : try{grid.Rows[n].Cells[7].Value = (grid.Rows[i].Cells[7] as DataGridViewComboBoxCell).Items[0];}catch{}; break; 
       } 

       try{grid.Rows[n].Cells[8].Value = table.Rows[i].ItemArray[9].ToString();}catch{} 
       try{grid.Rows[n].Cells[9].Value = table.Rows[i].ItemArray[10].ToString();}catch{} 
       try{grid.Rows[n].Cells[10].Value = table.Rows[i].ItemArray[11].ToString();}catch{} 
      } 

      LoadDGV1ToolTips(); 

      grid.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader); 
      grid.RowHeadersVisible      = false; 
      grid.EnableHeadersVisualStyles    = false; 
      grid.ColumnHeadersDefaultCellStyle.BackColor = Color.DimGray; 
      grid.ColumnHeadersDefaultCellStyle.ForeColor = Color.White; 
      grid.GridColor        = Color.RoyalBlue; 

      for(int i = 0 ; i < grid.Columns.Count; i++){ 
       grid.Columns[i].Width = (grid.Size.Width/grid.Columns.Count) - 1; 
      } 

     }catch(SqlException ex){ 
      MessageBox.Show("SQL ERROR: " + ex.ToString()); 
      MessageBox.Show(query); 
     } 
    } 

private void button4_Click(object sender, EventArgs e){ //SAVE 
     string name  = ""; 
     string date  = ""; 
     string file  = ""; 
     string operation = ""; 
     string brand  = ""; 
     string address = ""; 
     string found  = ""; 
     string match  = ""; 
     string secured = ""; 
     string relocated = ""; 
     string comment = ""; 
     Console.WriteLine("Column Count:  " + this.dataGridView1.ColumnCount); 
     for (int i = 0; i < this.dataGridView1.ColumnCount; i++){ 
      switch(i){ 
       //put some handlers in here for null values, try/catch? 
       case 0: try{name  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 1: try{date  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 2: try{file  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 3: try{operation = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 4: try{brand  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 5: try{address = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 6: try{found  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 7: try{match  = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 8: try{secured = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 9: try{relocated = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       case 10: try{comment = this.dataGridView1.SelectedCells[0].OwningRow.Cells[i].Value.ToString();}catch{}; break; 
       default: break; //Do Nothing. 
      } 
     } 
     if(secured != "True"){secured = "False";} 
     string query = (@" 
UPDATE Records 
SET HoldName = '" + name + "', BeginDate = '" + date + "', FileNumber = '" + file + "', Operation = '" + operation + "', Brand = '" + brand + "', PAddress = '" + address + "', Found = '" + found + "', Match = '" + match + "', Secured = '" + secured + "', Relocated = '" + relocated + "', Comment = '" + comment + "'" + 
"WHERE HLD_ID = '" + HLD_ID + "'"); 
     //WriteSQL(query); 
     Console.WriteLine("Query: " + query); 
     RefreshDGV1(); 
    }

來源

2016-02-05 RM Haley

我建議你第一次開始使用調試和試找出你的代碼中你有什麼問題的線..也是這是一個Web應用程序..？或者一個winforms應用程序..？你的代碼可以使用一些嚴重的重構和清理，我也會開始閱讀/研究如何爲所有的Sql對象使用'using（）{}'語句以及清理DataTable對象。。我個人會在類級別聲明...清理你的代碼格式在這裏也是非常混亂的 – MethodMan

當你有一個DataGridView，並且你有查詢無論是否返回數據或不..你可以得到列數基於DataTable.Columns.Count一旦它的DataBind（）方法已被調用..也爲什麼你有'InitializeComponent（）;'在你的ReadSQL（）方法' – MethodMan

我沒有收到嘗試獲取dataGridView1的錯誤。 ColumnCount，那麼調試器有什麼好處？這是一個使用Visual Studio的WinForms應用程序。你能否詳細說明「嚴重重構」和「清理」？不確定你在這裏的意思。我並不擔心在這一點上清理DataTable對象，我所要做的就是獲取此方法來確認dataGridView的存在，而不是。不要擔心這個問題以外的問題，因爲這超出了這個問題的範圍。 –

這裏要說的是，你可以用它來使調用存儲過程更好的靜態類也許你可以利用和借鑑它

//If you want to return a DataSet 
public static class SqlDBHelper 
{ 
    public static DataSet ExecuteDataSet(string sql, CommandType cmdType, params SqlParameter[] parameters) 
    { 
     using (DataSet ds = new DataSet()) 
     using (SqlConnection connStr = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString)) 
     using (SqlCommand cmd = new SqlCommand(sql, connStr)) 
     { 
      cmd.CommandType = cmdType; 
      foreach (var item in parameters) 
      { 
       cmd.Parameters.Add(item); 
      } 

      try 
      { 
       cmd.Connection.Open(); 
       new SqlDataAdapter(cmd).Fill(ds); 
      } 
      catch (Exception ex) 
      { 
       //throw; trap for you exception(s) here 
      } 
      return ds; 
     } 
    } 

    //if you want to return a DataTable  
    public static DataTable ExecuteDataSet(string sql, CommandType cmdType, params SqlParameter[] parameters) 
    { 
     using (DataSet ds = new DataSet()) 
     using (SqlConnection connStr = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString)) 
     using (SqlCommand cmd = new SqlCommand(sql, connStr)) 
     { 
      cmd.CommandType = cmdType; 
      foreach (var item in parameters) 
      { 
       cmd.Parameters.Add(item); 
      } 

      try 
      { 
       cmd.Connection.Open(); 
       new SqlDataAdapter(cmd).Fill(ds); 
      } 
      catch (Exception ex) 
      { 
       //Show a message or log a message on ex.Message 
      } 
      return ds.Tables[0]; 
     } 
    } 

}

來源

2016-02-05 20:16:02 MethodMan

你不應該以這種方式在catch塊中使用'throw ex'。您應該使用'throw;'來代替，因爲它保留了調用堆棧。但無論如何，這樣一個低級別的調用沒有業務捕捉和重新拋出錯誤，因爲在這個級別上，你不可能決定如何從異常中恢復。 – mason

C＃--DataGridView - 無法獲取ColumnCount，無法獲取單元格值

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