C＃更改DataGridViewCell值不起作用

Question

我有兩種形式（Form1，Form2）。 Form1顯示對象的值。 Form2允許用戶修改Form1中某個值的某些屬性。

側面說明：（在Form1，我編程方式創建標籤頁，並在每個標籤頁是一個DataGridView中）

我試圖從Form2的新字符串值傳送到一個DataGridView（即我只能從Form1獲得）。

我在Form1中創建了一個公共的Tab控件，可以訪問和搜索DataGridView。

我的代碼不會產生任何錯誤，但DataGridView中的單元格不會像它應該那樣更改。

我在做什麼錯？

//Form1 
//Create public access to the TabControl on Form1 
public TabControl xTabControl 
{ 
    get 
    { 
     return tabControl1; 
    } 
} 



//Form2 
private void btnSubmit_Click(object sender, EventArgs e) 
{ 
    string newText = txtDescription.Text.ToString(); //New Text 
    string tabName = txtTabName.Text.ToString(); //Name of the Tab to reference 

    int txtChanged = Int32.Parse(txtChanged.Text.ToString()); //0 = No Change, 1 = Change 
    int jobID = Int32.Parse(hidJobID.Text.ToString()); //Job ID 
    int rowIndex = Int32.Parse(hidRowIndex.Text.ToString()); //The row we must reference in our DataGridView 

    //Call the public method from Form1 to define the Tab Control 
    TabControl tabControl = Form1.xTabControl; 

    //Define the Tab Page 
    TabPage tbpage = new TabPage(); 
    tbpage = tabControl.TabPages[tabName]; 

    //If there is a Tab Page with that name then revise the cell 
    if (tbpage != null) 
    { 
     //Define a DataGridView object 
     DataGridView dgv = new DataGridView(); 

     //Find the DataGridView inside the TabPage (there is only 1 per Tab Page) 
     foreach (Control ctrl in tbpage.Controls) 
     { 
      dgv = (ctrl is DataGridView) ? (DataGridView)ctrl : dgv; 
     } 

     dgv.ReadOnly = false; 

     DataGridViewCell cellDescription = dgv.Rows[rowIndex].Cells[6]; 
     DataGridViewCell cellCatName = dgv.Rows[rowIndex].Cells[7]; 
     DataGridViewCell cellCat = dgv.Rows[rowIndex].Cells[8]; 

     if (txtChanged > 0) 
     { 
      MessageBox.Show(cellDescription.Value.ToString()); //<-- This returns the correct string on the DataGridView 
      dgv.CurrentCell = cellDescription; 
      cellDescription.ReadOnly = false; 
      cellDescription.Value = newText; //<-- This should update the Cell, but it isnt! 
     } 
     else 
     { 

     } 
    } 
} 

Answer 1

我不確定您當前的代碼不符合您的描述。編譯器，應抱怨的第一個問題是線以下：

int txtChanged = Int32.Parse(txtChanged.Text.ToString()); //0 = No Change, 1 = Change 

顯然可變txtChanged不能是string和int。我假設最初的txtChanged是TextBox的名稱Form2，其中用戶鍵入0表示不更改，1表示更改。我只是改名爲inttxtChanged到changeValue和if語句改變了這個變量if (changeValue > 0).

最後，我不知道，如果你能爲你引用父窗體標籤控件。我把公共屬性作爲你已經發布的表單標籤控件，並且它沒有正確地返回標籤控件。再次出現編譯時錯誤，指示Form1不包含xTabControl的定義。

爲了簡化而不是使標籤控制公共變量和訪問來自Form2這個公共變量的事情，簡單地傳遞TabControl到Form2這將允許雙向接入，無論是從父母標籤控件讀取或寫入它。

這些更改您的代碼後，似乎按預期工作。我認爲在TextBox命名txtDescription文本被在rowIndex行6列

設置到父母DataGridView在Form2，我們要建立一個全球性TabControl變量將指向Form1「傳遞TabControl秒。然後在Form2的構造函數中添加一個TabControl參數到其簽名，以允許父母通過其TabControl到Form2。像如下：

public partial class Form2 : Form { 

    public TabControl tabControl; 

    public Form2(TabControl parentTC) { 
    InitializeComponent(); 
    tabControl = parentTC; 
    } 

    private void btnSubmit_Click(object sender, EventArgs e) { 
    string newText = txtDescription.Text.ToString(); //New Text 
    string tabName = txtTabName.Text.ToString(); //Name of the Tab to reference 

    //int txtChanged = Int32.Parse(txtChanged.Text.ToString()); <-- changed this variable name 

    int changeValue = Int32.Parse(txtChanged.Text.ToString()); //0 = No Change, 1 = Change 
    int jobID = Int32.Parse(hidJobID.Text.ToString()); //Job ID 
    int rowIndex = Int32.Parse(hidRowIndex.Text.ToString()); //The row we must reference in our DataGridView 

    //Call the public method from Form1 to define the Tab Control 
    //TabControl tabControl = Form1.xTabControl; <-- This parent tab control is already defined above 

    //Define the Tab Page 
    TabPage tbpage = new TabPage(); 
    tbpage = tabControl.TabPages[tabName]; 

    //If there is a Tab Page with that name then revise the cell 
    if (tbpage != null) { 
     //Define a DataGridView object 
     DataGridView dgv = new DataGridView(); 

     //Find the DataGridView inside the TabPage (there is only 1 per Tab Page) 
     foreach (Control ctrl in tbpage.Controls) { 
     dgv = (ctrl is DataGridView) ? (DataGridView)ctrl : dgv; 
     } 

     dgv.ReadOnly = false; 

     DataGridViewCell cellDescription = dgv.Rows[rowIndex].Cells[6]; 
     DataGridViewCell cellCatName = dgv.Rows[rowIndex].Cells[7]; 
     DataGridViewCell cellCat = dgv.Rows[rowIndex].Cells[8]; 

     if (changeValue > 0) { 
     MessageBox.Show(cellDescription.Value.ToString()); //<-- This returns the correct string on the DataGridView 
     dgv.CurrentCell = cellDescription; 
     cellDescription.ReadOnly = false; 
     cellDescription.Value = newText; //<-- This should update the Cell, but it isnt! 
     } 
     else { 

     } 
    } 
    } 

} 

希望這會有所幫助。