如何根据数据集中的数据动态生成rdlc报表中的列?

Question

我想生成一个报告，其中列名和值应该是动态的，而不是。该列也应该是动态的。

Answer 1

你的问题很晦涩。 似乎下面的代码适用于您的目的：

public Form1()
{
dataGridView1.Dock = DockStyle.Fill;
dataGridView1.AutoSizeColumnsMode = 
DataGridViewAutoSizeColumnsMode.AllCells;
reportButton.Text = "Generate Report";
reportButton.Dock = DockStyle.Top;
reportButton.Click += new EventHandler(reportButton_Click);
Controls.Add(dataGridView1);
Controls.Add(reportButton);
Load += new EventHandler(Form1_Load);
Text = "DataGridViewComboBoxColumn Demo";
}
// Initializes the data source and populates the DataGridView control.
private void Form1_Load(object sender, EventArgs e)
{
PopulateLists();
dataGridView1.AutoGenerateColumns = false;
dataGridView1.DataSource = tasks;
AddColumns();
}
// Populates the employees and tasks lists. 
private void PopulateLists()
{
employees.Add(new Employee("Harry"));
employees.Add(new Employee("Sally"));
employees.Add(new Employee("Roy"));
employees.Add(new Employee("Pris"));
tasks.Add(new Task(1, employees[1]));
tasks.Add(new Task(2));
tasks.Add(new Task(3, employees[2]));
tasks.Add(new Task(4));
}
// Configures columns for the DataGridView control.
private void AddColumns()
{
DataGridViewTextBoxColumn idColumn = 
new DataGridViewTextBoxColumn();
idColumn.Name = "Task";
idColumn.DataPropertyName = "Id";
idColumn.ReadOnly = true;
DataGridViewComboBoxColumn assignedToColumn = 
new DataGridViewComboBoxColumn();
// Populate the combo box drop-down list with Employee objects. 
foreach (Employee e in employees) assignedToColumn.Items.Add(e);
// Add "unassigned" to the drop-down list and display it for 
// empty AssignedTo values or when the user presses CTRL+0. 
assignedToColumn.Items.Add("unassigned");
assignedToColumn.DefaultCellStyle.NullValue = "unassigned";
assignedToColumn.Name = "Assigned To";
assignedToColumn.DataPropertyName = "AssignedTo";
assignedToColumn.AutoComplete = true;
assignedToColumn.DisplayMember = "Name";
assignedToColumn.ValueMember = "Self";
// Add a button column. 
DataGridViewButtonColumn buttonColumn = 
new DataGridViewButtonColumn();
buttonColumn.HeaderText = "";
buttonColumn.Name = "Status Request";
buttonColumn.Text = "Request Status";
buttonColumn.UseColumnTextForButtonValue = true;
dataGridView1.Columns.Add(idColumn);
dataGridView1.Columns.Add(assignedToColumn);
dataGridView1.Columns.Add(buttonColumn);
// Add a CellClick handler to handle clicks in the button column.
dataGridView1.CellClick +=
new DataGridViewCellEventHandler(dataGridView1_CellClick);
}
// Reports on task assignments. 
private void reportButton_Click(object sender, EventArgs e)
{
StringBuilder report = new StringBuilder();
foreach (Task t in tasks)
{
String assignment = 
t.AssignedTo == null ? 
"unassigned" : "assigned to " + t.AssignedTo.Name;
report.AppendFormat("Task {0} is {1}.", t.Id, assignment);
report.Append(Environment.NewLine);
}
MessageBox.Show(report.ToString(), "Task Assignments");
}
// Calls the Employee.RequestStatus method.
void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
// Ignore clicks that are not on button cells. 
if (e.RowIndex < 0 || e.ColumnIndex !=
dataGridView1.Columns["Status Request"].Index) return;
// Retrieve the task ID.
Int32 taskID = (Int32)dataGridView1[0, e.RowIndex].Value;
// Retrieve the Employee object from the "Assigned To" cell.
Employee assignedTo = dataGridView1.Rows[e.RowIndex]
.Cells["Assigned To"].Value as Employee;
// Request status through the Employee object if present. 
if (assignedTo != null)
{
assignedTo.RequestStatus(taskID);
}
else
{
MessageBox.Show(String.Format(
"Task {0} is unassigned.", taskID), "Status Request");
}
}
}