Hi,
Welcome to our Microsoft Q&A platform!
It may be that some corrupted XML in App.config is causing the issue,see the following link:
Thanks.
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This is a MSDN question asked by Noahi23, the source is ERROR: System.Xml.XmlException: 'Name cannot begin with the '<' character, hexadecimal value 0x3C.
Whenever I try to send a POST request to my API it gives me this error in my WPF application. I've tried to search for "<<<" in my application but there were no results for this. I've been trying to fix this issues for several days, but with no luck.
This is my back-end of my WPF page:
{
// create new restclient class, with the base url filled in the ()
var client = new RestClient("http://thewebsite.com");
// create new restrequest class, withe the rest of the url we want filled in
var request = new RestRequest("/api/v2/projects");
string title = Title.Text;
string description = Description.Text;
string deadline = Deadline.Text;
// add the content here: user is automatically created related to the api token, they will be the owner.
request.AddBody(new { title = title, description = description, deadline = deadline});
request.Method = Method.POST;
request.AddHeader("Accept", "application/json");
client.AddDefaultHeader("Authorization", string.Format("Bearer {0}", Global.ApiToken));
// we execute and get the content
var response = client.Execute(request);
if (response.StatusCode.ToString() == "OK" || response.StatusCode.ToString() == "200")
{
MessageBox.Show("OK");
}
else if (response.StatusCode.ToString() == "422")
{
MessageBox.Show("NOT OK");
}
else if (response.StatusCode.ToString() == "401")
{
MessageBox.Show("Unauth");
}
else
{
MessageBox.Show("??");
}
The front end (XAML):
<UserControl x:Class="Prototype.Projects.ProjectCreate"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Prototype.Projects"
mc:Ignorable="d"
d:DesignHeight="570" d:DesignWidth="830">
<!-- whole projects grid -->
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="51*" />
<RowDefinition Height="55*" />
<RowDefinition Height="Auto" MinHeight="464"/>
</Grid.RowDefinitions>
<Grid.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFA0A0A0" Offset="1" />
<GradientStop Color="#FFDADADA" />
</LinearGradientBrush>
</Grid.Background>
<!-- Tab Description -->
<Grid Row="0">
<TextBlock Margin="10" FontFamily="Century Gothic" FontSize="25" Text="Nieuw Project" />
</Grid>
<Grid Row="1">
<TextBlock Margin="10" FontSize="20" FontFamily="century gothic" TextWrapping="Wrap"
Text="Voer hieronder de informatie van het project in" Grid.ColumnSpan="3" />
</Grid>
<!-- Backlog Items -->
<Grid Row="2">
<StackPanel>
<Grid>
<Label FontFamily="century gothic" Margin="55,10,4,10">Titel</Label>
<TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
Margin="0,10,110,10" Width="600" Name="Title" />
</Grid>
<Grid>
<Label FontFamily="century gothic" Margin="10,10,38,10">Beschrijving</Label>
<TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
Margin="0,10,110,10" Width="600" Height="100" TextWrapping="Wrap" Name="Description"/>
</Grid>
<Grid>
<Label FontFamily="century gothic" Margin="25,10,20,10">Deadline (2020-01-15 00:00:00)</Label>
<TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
Margin="0,10,562,10" Width="148" Name="Deadline"/>
<!-- -->
<Button x:Name="Create_Project_Button" FontFamily="century gothic" VerticalAlignment="Bottom" HorizontalAlignment="Right"
Width="250" Margin="0,0,110,13" Click="Create_Project_Button_Click">
<TextBlock FontFamily="century gothic">Project aanmaken</TextBlock>
</Button>
</Grid>
<!-- -->
<!-- -->
</StackPanel>
<!-- -->
<!-- -->
</Grid>
</Grid>
</UserControl>
Hi,
Welcome to our Microsoft Q&A platform!
It may be that some corrupted XML in App.config is causing the issue,see the following link:
Thanks.