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Add event args to non-rendering example (#24168)

pull/24169/head
Luke Latham 2021-12-02 03:21:10 -06:00 committed by GitHub
parent 63d4794359
commit 4e45670ba4
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1 changed files with 63 additions and 18 deletions
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aspnetcore/blazor/performance.md
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@ -485,8 +485,9 @@ Call `EventUtil.AsNonRenderingEventHandler` to call an event handler that doesn'
In the following example:
* Selecting the first button, which calls `HandleSelectRerender`, triggers a rerender.
* Selecting the second button, which calls `HandleSelectWithoutRerender`, doesn't trigger a rerender.
* Selecting the first button, which calls `HandleClick1`, triggers a rerender.
* Selecting the second button, which calls `HandleClick2`, doesn't trigger a rerender.
* Selecting the third button, which calls `HandleClick3`, doesn't trigger a rerender and uses [event arguments](xref:blazor/components/event-handling#event-arguments) (<xref:Microsoft.AspNetCore.Components.Web.MouseEventArgs>).
`Pages/HandleSelect2.razor`:
@ -499,30 +500,44 @@ In the following example:
Last render DateTime: @dt
</p>
<button @onclick="HandleSelectRerender">
<button @onclick="HandleClick1">
Select me (Rerenders)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleSelectWithoutRerender)">
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleClick2)">
Select me (Avoids Rerender)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler<MouseEventArgs>(HandleClick3)">
Select me (Avoids Rerender and uses <code>MouseEventArgs</code>)
</button>
@code {
private DateTime dt = DateTime.Now;
private void HandleSelectRerender()
private void HandleClick1()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler triggers a rerender.");
}
private void HandleSelectWithoutRerender()
private void HandleClick2()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler doesn't trigger a rerender.");
}
private void HandleClick3(MouseEventArgs args)
{
dt = DateTime.Now;
Logger.LogInformation(
"This event handler doesn't trigger a rerender. " +
"Mouse coordinates: {ScreenX}:{ScreenY}",
args.ScreenX, args.ScreenY);
}
}
```
@ -1218,8 +1233,9 @@ Call `EventUtil.AsNonRenderingEventHandler` to call an event handler that doesn'
In the following example:
* Selecting the first button, which calls `HandleSelectRerender`, triggers a rerender.
* Selecting the second button, which calls `HandleSelectWithoutRerender`, doesn't trigger a rerender.
* Selecting the first button, which calls `HandleClick1`, triggers a rerender.
* Selecting the second button, which calls `HandleClick2`, doesn't trigger a rerender.
* Selecting the third button, which calls `HandleClick3`, doesn't trigger a rerender and uses [event arguments](xref:blazor/components/event-handling#event-arguments) (<xref:Microsoft.AspNetCore.Components.Web.MouseEventArgs>).
`Pages/HandleSelect2.razor`:
@ -1232,30 +1248,44 @@ In the following example:
Last render DateTime: @dt
</p>
<button @onclick="HandleSelectRerender">
<button @onclick="HandleClick1">
Select me (Rerenders)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleSelectWithoutRerender)">
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleClick2)">
Select me (Avoids Rerender)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler<MouseEventArgs>(HandleClick3)">
Select me (Avoids Rerender and uses <code>MouseEventArgs</code>)
</button>
@code {
private DateTime dt = DateTime.Now;
private void HandleSelectRerender()
private void HandleClick1()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler triggers a rerender.");
}
private void HandleSelectWithoutRerender()
private void HandleClick2()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler doesn't trigger a rerender.");
}
private void HandleClick3(MouseEventArgs args)
{
dt = DateTime.Now;
Logger.LogInformation(
"This event handler doesn't trigger a rerender. " +
"Mouse coordinates: {ScreenX}:{ScreenY}",
args.ScreenX, args.ScreenY);
}
}
```
@ -1943,8 +1973,9 @@ Call `EventUtil.AsNonRenderingEventHandler` to call an event handler that doesn'
In the following example:
* Selecting the first button, which calls `HandleSelectRerender`, triggers a rerender.
* Selecting the second button, which calls `HandleSelectWithoutRerender`, doesn't trigger a rerender.
* Selecting the first button, which calls `HandleClick1`, triggers a rerender.
* Selecting the second button, which calls `HandleClick2`, doesn't trigger a rerender.
* Selecting the third button, which calls `HandleClick3`, doesn't trigger a rerender and uses [event arguments](xref:blazor/components/event-handling#event-arguments) (<xref:Microsoft.AspNetCore.Components.Web.MouseEventArgs>).
`Pages/HandleSelect2.razor`:
@ -1957,30 +1988,44 @@ In the following example:
Last render DateTime: @dt
</p>
<button @onclick="HandleSelectRerender">
<button @onclick="HandleClick1">
Select me (Rerenders)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleSelectWithoutRerender)">
<button @onclick="EventUtil.AsNonRenderingEventHandler(HandleClick2)">
Select me (Avoids Rerender)
</button>
<button @onclick="EventUtil.AsNonRenderingEventHandler<MouseEventArgs>(HandleClick3)">
Select me (Avoids Rerender and uses <code>MouseEventArgs</code>)
</button>
@code {
private DateTime dt = DateTime.Now;
private void HandleSelectRerender()
private void HandleClick1()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler triggers a rerender.");
}
private void HandleSelectWithoutRerender()
private void HandleClick2()
{
dt = DateTime.Now;
Logger.LogInformation("This event handler doesn't trigger a rerender.");
}
private void HandleClick3(MouseEventArgs args)
{
dt = DateTime.Now;
Logger.LogInformation(
"This event handler doesn't trigger a rerender. " +
"Mouse coordinates: {ScreenX}:{ScreenY}",
args.ScreenX, args.ScreenY);
}
}
```