# MgGrid — Columns

> Part of the MgGrid system. See `README.md` for overview and component hierarchy.

## MgGridDataColumn

Extended `DxGridDataColumn` with InfoPanel and URL link support.

| Parameter | Type | Default | Description |
|---|---|---|---|
| `ShowInInfoPanel` | `bool` | `true` | Whether this column is visible in InfoPanel |
| `InfoPanelDisplayFormat` | `string?` | `null` | Custom display format for InfoPanel |
| `InfoPanelOrder` | `int` | `int.MaxValue` | Column order in InfoPanel (lower = earlier) |
| `InfoPanelEditTemplate` | `RenderFragment<MgGridInfoPanelEditContext>?` | `null` | Custom InfoPanel editor (edit mode) — takes precedence over the `EditSettings` / property-type default editors |
| `UrlLink` | `string?` | `null` | URL template with `{Property}` placeholders |

**UrlLink example:** `https://admin.example.com/Entity/Edit/{Id}` — renders cell as `<a href="..." target="_blank">`.

## InfoPanelEditTemplate

Use when the grid-side editor is a `CellEditTemplate` the InfoPanel cannot reuse (it is bound to the grid-cell
context) — without it, the panel falls back to the property-type default editor (e.g. `int` → number spinner).
Context: `MgGridInfoPanelEditContext(object EditModel, Action Refresh)` — call `Refresh()` after mutations
other fields depend on (cascading lookups), it re-renders the InfoPanel.

```razor
<MgGridDataColumn FieldName="CategoryId" Caption="Category">
    <CellEditTemplate>@CategoryEditor((MyItem)context.EditModel)</CellEditTemplate>
    <InfoPanelEditTemplate>@CategoryEditor((MyItem)context.EditModel, context.Refresh)</InfoPanelEditTemplate>
</MgGridDataColumn>
```

Define the editor once as a shared fragment (`private RenderFragment CategoryEditor(MyItem item, Action? refresh = null) => @<DxComboBox ...>;`)
so the grid cell and the InfoPanel render the same component — no duplicated markup.

Uses compiled property accessors (`ConcurrentDictionary` cache) for performance.