Hello. When I try to change the first column (or any column in the middle) in RadzenDataGrid I catch an exception 'The ParameterView instance can no longer be read because it has expired. ParameterView can only be read synchronously and must not be stored for later use'. In my scenario I need the user to be able to select a specific range of days (columns) from an property collection of objects. How can I solve this problem? Example in the code below
<RadzenStack Orientation="Orientation.Horizontal">
<RadzenNumeric @bind-Value=@StartIndex></RadzenNumeric>
<RadzenNumeric @bind-Value=@MaxColumns></RadzenNumeric>
</RadzenStack>
<RadzenDataGrid Data="@employees" TItem="Employee" ColumnWidth="100px">
<Columns>
<RadzenDataGridColumn Property="FirstName" Title="FirstName" TItem="Employee" Width="300px">
<Template Context="data">
<RadzenStack Orientation="Orientation.Vertical" Style="position:relative">
@data.FirstName
</RadzenStack>
</Template>
</RadzenDataGridColumn>
<RadzenDataGridColumn Property="LastName" Title="LastName" TItem="Employee" Width="300px">
<Template Context="data">
<RadzenStack Orientation="Orientation.Vertical">
@data.LastName
</RadzenStack>
</Template>
</RadzenDataGridColumn>
@for (int i = StartIndex; i < MaxColumns; i++)
{
<RadzenDataGridColumn Property="MotnthValues" Title="@($"Month {i}")" TItem="Employee" >
<Template Context="data">
<RadzenStack Orientation="Orientation.Vertical">
@data.MotnthValues[i]
</RadzenStack>
</Template>
</RadzenDataGridColumn>
}
</Columns>
</RadzenDataGrid>
@code {
private int StartIndex;
private int MaxColumns;
protected override void OnInitialized()
{
MaxColumns = 30;
employees = GenerateEmployees();
}
private Random random = new Random();
private string[] names = new string[]
{
"Alan", "John", "Sam", "Mike", "Luther", "Samantha", "Kate", "Margo", "Anna", "Mia"
};
private string[] lastNames = new string[]
{
"Smith", "Williams", "Johnson", "Brown", "Lee", "Miller", "Anderson", "Olson", "Garcia", "Chavez"
};
private List<Employee> employees = new List<Employee>();
private List<Employee> GenerateEmployees()
{
var generatedEmployees = new List<Employee>();
for (int i = 1; i <= 50; i++)
{
generatedEmployees.Add(new Employee
{
Id = i,
FirstName = names[random.Next(0, 9)],
LastName = lastNames[random.Next(0, 9)],
MotnthValues = GenerateValues()
});
}
return generatedEmployees;
}
private List<int> GenerateValues()
{
var values = new List<int>();
for (int i = 0; i <= MaxColumns; i++)
{
values.Add(random.Next(1, 1000));
}
return values;
}
}