求助：Visual Studio中C#向ComponentOne C1List添加行无显示问题

Hey there, I’ve spent a fair amount of time working with ComponentOne’s C1List control, so let’s walk through why your rows might not be displaying even after following the docs. Here are the most common fixes:

1. Double-Check Your Data Mode Setting #

C1List behaves drastically differently depending on its DataMode—this is probably the most frequent culprit. If you’re adding rows manually (unbound mode), make sure you’ve explicitly set:

c1List1.DataMode = DataModeEnum.Unbound;

If you accidentally leave it in Bound mode, adding rows directly to the control won’t work at all—you’ll need to bind a data source (like a DataTable) and modify that instead.

2. Use the Correct Method to Add Rows #

In unbound mode, there are two reliable ways to populate rows:

• Using AddItem(): Pass a comma-separated string of values that matches your column order:

  // Add a row with values for each column in sequence
  c1List1.AddItem("101,Alice Smith,Marketing");
  

• Using the Rows collection: This is more explicit and great for setting values by column name (avoids mix-ups if column order changes):

  var newRow = c1List1.Rows.Add();
  newRow["EmployeeID"] = "102";
  newRow["Name"] = "Bob Johnson";
  newRow["Department"] = "Engineering";
  

Pro tip: Always define your columns first before adding rows—otherwise, the control won’t know where to place the data.

3. Refresh the Control After Adding Rows #

Sometimes the UI doesn’t update automatically after data changes. After adding your rows, force a refresh to make sure the new content shows up:

c1List1.Refresh();

4. Verify Column Widths and Visibility #

It’s easy to overlook—if your columns have a width of 0 or are marked as hidden, your data will exist but be completely invisible. Check these settings either via the C1List Designer (right-click the control → Designer) or in code:

// Ensure columns are visible and have a valid width
c1List1.Columns["EmployeeID"].Width = 75;
c1List1.Columns["EmployeeID"].Visible = true;

5. Confirm Your View Mode #

Make sure the control is set to DetailsView (the default for grid-style display). If it’s in another mode like ListBox, you might only see one column or nothing at all. Check this in the Designer or via:

c1List1.View = ViewEnum.DetailsView;

Full Working Example #

Here’s a quick snippet you can test in your Form_Load event to rule out setup issues:

private void Form1_Load(object sender, EventArgs e)
{
    // Configure unbound mode
    c1List1.DataMode = DataModeEnum.Unbound;

    // Add columns with display names
    c1List1.Columns.Add("EmployeeID", "ID");
    c1List1.Columns.Add("Name", "Full Name");
    c1List1.Columns.Add("Department", "Dept");

    // Set readable column widths
    c1List1.Columns["EmployeeID"].Width = 75;
    c1List1.Columns["Name"].Width = 150;
    c1List1.Columns["Department"].Width = 120;

    // Add sample rows using both methods
    c1List1.AddItem("101,Alice Smith,Marketing");
    c1List1.AddItem("102,Bob Johnson,Engineering");

    var row = c1List1.Rows.Add();
    row["EmployeeID"] = "103";
    row["Name"] = "Charlie Davis";
    row["Department"] = "Finance";

    // Refresh to render all changes
    c1List1.Refresh();
}

If none of these fix it, double-check for any code that might be clearing the Rows collection or overriding the DataMode later in your workflow—sometimes a stray line of code can undo your setup.

内容的提问来源于stack exchange，提问作者Ray Yago