问题描述
这是我到目前为止所拥有的：
Here is what i have so far :
#region Method For Loading Data
private async Task Loading(Func<string> SearchStringForUser)
{
ObservableCollection<VW_Users> collection = new ObservableCollection<VW_Users>();
object @lock = new object();
BindingOperations.EnableCollectionSynchronization(collection, @lock);
DataGrid_User.ItemsSource = collection;
await Task.Run(() =>
{
using (SqlConnection connection = new SqlConnection(PublicVar.ConnectionString))
{
SqlCommand command = new SqlCommand("select * From VW_Users where 1 = 1 And @GymID = @GymId", connection);
command.Parameters.AddWithValue("@GymID", PublicVar.GymID + " " + SearchStringForUser());
connection.Open();
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
const int N = 10;
VW_Users[] cache = new VW_Users[N];
int counter = 0;
while (reader.Read())
{
VW_Users obj = new VW_Users();
obj.UserID = Convert.ToInt32(reader["UserID"]);
obj.UserName = Convert.ToString(reader["UserName"]);
cache[counter] = obj;
//...and so on for each property...
if (++counter == N)
{
//add N items to the source collection
foreach (VW_Users x in cache)
{
collection.Add(x);
}
counter = 0;
this.Dispatcher.InvokeAsync(() => {
MyProg.Value += 20;
});
////add a delay so you actually have a chance to see that N items are added at a time
System.Threading.Thread.Sleep(500);
}
}
//add any remaining items
for (int i = 0; i < counter; ++i)
{
collection.Add(cache[i]);
}
}
reader.Close();
}
});
}
#endregion
正在等待将数据加载到我的datagrid，现在我有两个问题
我如何使图像旋转360度像加载图像...
，我的重要问题是我如何显示进度条$ b $加载的数据b就像当加载10％的数据时，进度栏值获得10％时，进度栏获得100％。我在我的代码中将进度条称为 MyProg，但它不能正常工作。最好的主意是什么？
its awaiting for load data into my datagrid , now i have two qustion right here how i can make a image rotated 360 like loading image...and my important qustion is how i can show the loaded data by Progress barlike when 10% of datas loaded my Progress bar value get 10% when it done my Progress bar get 100% . i callled my Progress bar "MyProg" in my codes, but it dont work nicey. what is best idea for do that?
推荐答案
在您阅读完查询之前，不知道您的查询将返回多少行，因此无法确定在当前实现下您已经处理了10％的行。您可能要使用 ProgressBar ，并且 IsIndeterminate 属性设置为 true 。
You don't know how many rows your query will return until you have read them so there is no way to know that you have processed 10% given your current implementation. You may want to use a ProgressBar with the IsIndeterminate property set to true though.
正如@bommelding指出的那样，您可能还想考虑使用 SqlDataReader 类的异步API来代替使用 Task.Run ：
As @bommelding pointed out, you may also want to consider using the asynchronous API of the SqlDataReader class instead of using Task.Run: https://blogs.msdn.microsoft.com/adonet/2012/07/15/using-sqldatareaders-new-async-methods-in-net-4-5-part-2-examples/
给出一个 Image 元素像这样添加到您的XAML标记中：
Given an Image element that you have added to your XAML markup like this:
<Image x:Name="image" Source="image.png" />
..您可以设置其 LayoutTransform 或将 RenderTransform 属性设置为您动画化的 RotateTransform 属性：
..you can set its LayoutTransform or RenderTransform property to a RotateTransform that you animate like this:
RotateTransform rotateTransform = new RotateTransform();
image.RenderTransform = rotateTransform;
image.RenderTransformOrigin = new Point(0.5, 0.5);
rotateTransform.BeginAnimation(RotateTransform.AngleProperty,
new DoubleAnimation() { From = 0, To = 360, Duration = TimeSpan.FromSeconds(1), RepeatBehavior = RepeatBehavior.Forever, FillBehavior = FillBehavior.Stop });
await Task.Run(...);
rotateTransform.BeginAnimation(RotateTransform.AngleProperty, null);
这篇关于通过进度栏将数据加载到datagrid match中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！