我有一個 WinForm，它要求在文本框中插入電子郵件，單擊搜索按鈕后，sql 查詢將搜索表中的記錄并將結果顯示在 DataGridView 中。這里是搜索按鈕的代碼
private void RegUnregSearchButton_Click(object sender, EventArgs e)
{
var dataAccess = new DataAccess();
var output = dataAccess.BindGrid(EmailTextBox.Text);
DataGridView1.DataSource = output;
}
BindGrid 的目的是根據查詢結果自動填充資料表的列和行，但現在我正在手動執行此操作，因為我無法理解如何從 Dapper 結果中檢索列。
public class DataAccess
{
public DataTable BindGrid(string param)
{
DataTable dataTable = new DataTable();
//Helper.connString("SqlConnectionString") will take the connection string from an app.config and return the value. Connection works.
using (IDbConnection connection = new System.Data.SqlClient.SqlConnection(Helper.connString("SqlConnectionString")))
{
var result = connection.Query("SELECT Company, Email, Role, Id, Status from table WHERE Email = '{param}'").ToList();
RegUnregUser user = new RegUnregUser();
user.company = result.Select(x => x.Company).FirstOrDefault();
user.email = result.Select(x => x.Email).FirstOrDefault();
user.role = result.Select(x => x.Role).FirstOrDefault();
user.id = result.Select(x => x.Id).FirstOrDefault();
user.status = result.Select(x => x.Status).FirstOrDefault();
dataTable.Columns.Add("Company");
dataTable.Columns.Add("Email");
dataTable.Columns.Add("Role");
dataTable.Columns.Add("Id");
dataTable.Columns.Add("Status");
dataTable.Rows.Add(user.company, user.email, user.role, user.id, user.status);
return dataTable;
}
}
}
RegUnregUser 類：
public class RegUnregUser
{
public string company { get; set; }
public string email { get; set; }
public string role { get; set; }
public object id { get; set; }
public string status { get; set; }
}
uj5u.com熱心網友回復：
Dapper 用于映射到自定義物件，而不是用于 DataTables。話雖如此，你應該能夠做到這一點：
public class DataAccess
{
public DataTable BindGrid(string param)
{
//Helper.connString("SqlConnectionString") will take the connection string from an app.config and return the value. Connection works.
using (IDbConnection connection = new System.Data.SqlClient.SqlConnection(Helper.connString("SqlConnectionString")))
{
var reader = connection.ExecuteReader("SELECT Company, Email, Role, Id, Status from table WHERE Email = @Email",
new {Email=param});
return new DataTable().Load(reader);
}
}
}
請注意，我正在使用引數化查詢。您的代碼容易受到 SQL 注入的影響。
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