運行虛空從形式1使用表2

Question

我'嘗試從Form2的執行虛空和更新Form1中我試圖將它添加按鈕點擊也Form_Close，還取決於Form1_Activated，Form1_Enter但仍然沒有進展

這裏是我試過:(但在做沒有運氣它的工作...

Form1.cs的

public void LoadTable() 
{ 
    //Code to Populate Datagridview 
    string sql = ""; 
    SqlConnection Connection = new SqlConnection(Global.Connection); 
    SqlCommand CMD = new SqlCommand(sql, Connection); 

    SqlDataAdapter DA = new SqlDataAdapter(); 
    DA.SelectCommand = CMD; 

    DataSet DS = new DataSet(); 
    DA.Fill(DS); 

    ApplicantsGrid.DataSource = DS.Tables[0].DefaultView; 
} 
private void Form1Button_Click(object sender, EventArgs e) 
{ 
    Form2 Form2 = new Form2(); 
    Form2.showDialog(); 
} 

Form2.cs

private void Form2Button_Click(object sender, EventArgs e) 
{ 
     Form1 Form1 = new Form1(); 
     Form1.LoadTable(); 
} 

以及這是程序iam製作的主要問題:(

Answer 1

我很確定，你是你想做的事情。

您在Form1的新實例上調用LoadTable。正如Sayse所建議的那樣，您可能需要的是將其稱爲現有表格。

您可能想要在現有實例上調用它。你可能會實現，像這種情況，例如：

Form1中Button_Click代碼：

class Form1 
{ 
    public static Form1 Instance {get; private set;} 

    public Form1() 
    { 
     Instance = this; 
     //InitializeComponents and what ever else. 
    } 

    public void LoadTable() 
    { 
     //implementation 
    } 
} 

Form2的代碼：

private void Button_Click(object sender, EventArgs e) 
{ 
    if (Form1.Instance != null) //must be careful about this. 
    { 
     Form1.Instance.LoadTable(); //like this you will call the method on the existing instance of the form. 
    } 
} 

Answer 2

public partial class Form1 : Form 
    { 
     internal static Form1 ViewForm1; // Make other form run Public void from Form1 

     public form1() 
     { 
      InitializeComponent(); 
      ViewForm1 = this; //Add this 
     } 
     public void DoSomething() 
     { 
      //Code here... 
     } 
} 


public partial class Form1 : Form 
    { 
     public form2() 
     { 
      InitializeComponent();    
      Form1.ViewForm1.ShowData(); // Call public void from form1 
     } 
    } 

 public partial class Form1 : Form 
 
     { 
 
      internal static Form1 ViewForm1; // Make other form run Public void from Form1 
 

 
      public form1() 
 
      { 
 
       InitializeComponent(); 
 
       ViewForm1 = this; //Add this 
 
      } 
 
      public void DoSomething() 
 
      { 
 
       //Code here... 
 
      } 
 
    } \t 
 
\t 
 

 
    public partial class Form1 : Form 
 
     { 
 
      public form2() 
 
      { 
 
       InitializeComponent();    
 
       Form1.ViewForm1.ShowData(); // Call public void from form1 
 
      } 
 
\t \t }