C# GridView没有'；不显示数据

数据库更新后，GridView没有显示数据。

摘自本文的

DataBind

属性

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ASP示例

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此代码段向您展示了如何（a）通过使用Databind方法分配数据集，将数据集绑定到gridview

该网站还说：

使用DataBind（）方法将数据源中的数据绑定到GridView控件。此方法解析控件的活动模板中的所有数据绑定表达式

解决方案

我想引用这句话：

 void Page_Load(Object sender, EventArgs e)
  {

    // This example uses Microsoft SQL Server and connects
    // to the Northwind sample database. The data source needs
    // to be bound to the GridView control only when the 
    // page is first loaded. Thereafter, the values are
    // stored in view state.                      
    if(!IsPostBack)
    {
      // Declare the query string.
      String queryString = 
        "Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]";

      // Run the query and bind the resulting DataSet
      // to the GridView control.
      DataSet ds = GetData(queryString);
      if (ds.Tables.Count > 0)
      {
        AuthorsGridView.DataSource = ds;
        AuthorsGridView.DataBind();
      }
      else
      {
        Message.Text = "Unable to connect to the database.";
      }

    }     

  }

  DataSet GetData(String queryString)
  {

    // Retrieve the connection string stored in the Web.config file.
    String connectionString = ConfigurationManager.ConnectionStrings["NorthWindConnectionString"].ConnectionString;      

    DataSet ds = new DataSet();

    try
    {
      // Connect to the database and run the query.
      SqlConnection connection = new SqlConnection(connectionString);        
      SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection);

      // Fill the DataSet.
      adapter.Fill(ds);

    }
    catch(Exception ex)
    {

      // The connection failed. Display an error message.
      Message.Text = "Unable to connect to the database.";

    }

    return ds;

  }

实际上，将数据绑定到控件

旁注

为了保护自己不受SQLi的影响，您应该仔细阅读，而不是直接连接

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WINFORM示例

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找到了教程：

此外：

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此处缺少用于调用数据绑定方法的Use。请使用以下代码：

//the DataGridView
DataGridView dgView = new DataGridView();

//BindingSource to sync DataTable and DataGridView
BindingSource bSource = new BindingSource();

//set the BindingSource DataSource
bSource.DataSource = dTable;

//set the DataGridView DataSource
dgView.DataSource = bSource;

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尝试使用此格式？

删除此行dataGridView1.DataSource=“”；并包括更多详细信息，以便我们可以帮助您…我的登录名是<代码>MrSQLInjection'）；DROP TABLE LibraryInfo--注意不要使用我的名字；）OP唯一缺少的部分是

dataGridView1.DataBind（）请使用.DataBind（）绑定数据是否有不能使用的原因？您试图如何处理此答案？演示如何绑定gridview，如问题中所述。我也可以问你为什么要发表评论？写得很好，但它只适用于asp.net。OPs的问题是关于winforms的，他很晚才指出（很遗憾！）。我已经在问题下要求澄清，因此将编辑我的答案（取决于回答）。GridView1.DataBind（）的一部分中有错误；，似乎它无法重新编码.DataBind（）；
 AuthorsGridView.DataBind();

//create the connection string
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\myDatabase.mdb";

//create the database query
string query = "SELECT * FROM MyTable";

//create an OleDbDataAdapter to execute the query
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);

//create a command builder
OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(dAdapter);

//create a DataTable to hold the query results
DataTable dTable = new DataTable();

//fill the DataTable
dAdapter.Fill(dTable);

//the DataGridView
DataGridView dgView = new DataGridView();

//BindingSource to sync DataTable and DataGridView
BindingSource bSource = new BindingSource();

//set the BindingSource DataSource
bSource.DataSource = dTable;

//set the DataGridView DataSource
dgView.DataSource = bSource;

 DataAdapter adapter=new DataAdapter(SqlCommand,SqlConn);
 DataTable tbl=new Datatable();
 adapter.Fill(tbl);
 GridView1.DataSource=tbl;
 GridView1.DataBind();//This line is missing in your code