:bug: 修复一些问题

Plain Craft Launcher 2/Modules/Base/ModValidate.vb

@@ -314,6 +314,7 @@ End Class
 Public Class ValidateFolderPath
     Inherits Validate
     Public Property UseMinecraftCharCheck As Boolean = True
+    Public Property AllowNull As Boolean = False
     Public Sub New()
     End Sub
     Public Sub New(UseMinecraftCharCheck As Boolean)
@@ -325,9 +326,9 @@ Public Class ValidateFolderPath
         If Not Str.TrimEnd("\").EndsWithF(":") Then Str = Str.TrimEnd("\")
         '检查是否为空
         Dim LengthCheck As String = New ValidateNullOrWhiteSpace().Validate(Str)
-        If Not LengthCheck = "" Then Return LengthCheck
+        If Not AllowNull AndAlso Not LengthCheck = "" Then Return LengthCheck
         '检查长度
-        LengthCheck = New ValidateLength(1, 254).Validate(Str)
+        LengthCheck = New ValidateLength(If(AllowNull, 0, 1), 254).Validate(Str)
         If Not LengthCheck = "" Then Return LengthCheck
         '检查开头
         If Str.StartsWithF("\\Mac\") Then GoTo Fin

Plain Craft Launcher 2/Modules/Minecraft/ModModpack.vb

@@ -987,9 +987,11 @@ Retry:
 
             '步骤 1：从 Modrinth 获取 Mod 工程信息，得到 URL
             Dim Mods As New List(Of McMod)
-            For Each m In Directory.EnumerateFiles(Version.Path & "mods\")
-                If m.EndsWithF(".jar") Then Mods.Add(New McMod(m))
-            Next
+            If Directory.Exists(Version.Path & "mods\") Then
+                For Each m In Directory.EnumerateFiles(Version.Path & "mods\")
+                    If m.EndsWithF(".jar") Then Mods.Add(New McMod(m))
+                Next
+            End If
 
             '从 Modrinth 获取信息
             Dim ModrinthHashes = Mods.Select(Function(m) m.ModrinthHash).ToList()

Plain Craft Launcher 2/Pages/PageVersion/PageVersionExport.xaml

@@ -38,11 +38,7 @@
                             <RowDefinition Height="28" />
                         </Grid.RowDefinitions>
                         <TextBlock Grid.Row="0" VerticalAlignment="Center" HorizontalAlignment="Left" Text="整合包名称" Margin="0,0,25,0" />
-                        <local:MyTextBox Grid.Row="0" x:Name="TbExportName" Grid.ColumnSpan="2" Grid.Column="1" MaxLength="100">
-                            <local:MyTextBox.ValidateRules>
-                                <local:ValidateFileName AllowNull="True" />
-                            </local:MyTextBox.ValidateRules>
-                        </local:MyTextBox>
+                        <local:MyTextBox Grid.Row="0" x:Name="TbExportName" Grid.ColumnSpan="2" Grid.Column="1" MaxLength="100" ShowValidateResult="True" />
                         <TextBlock Grid.Row="2" VerticalAlignment="Center" HorizontalAlignment="Left" Text="整合包版本" Margin="0,0,25,0" />
                         <local:MyTextBox Grid.Row="2" x:Name="TbExportVersion" HintText="1.0.0" Grid.ColumnSpan="2" Tag="VersionArgumentTitle" Grid.Column="1" MaxLength="100" />
                         <TextBlock Grid.Row="4" VerticalAlignment="Center" HorizontalAlignment="Left" Text="图标" Margin="0,0,25,0"  />

Plain Craft Launcher 2/Pages/PageVersion/PageVersionExport.xaml.vb

@@ -14,6 +14,11 @@
             Selected = New List(Of String)
             CurrentVer = PageVersionLeft.Version.Path
         End If
+
+        TbExportName.ShowValidateResult = True
+        TbExportName.ValidateRules = New ObjectModel.Collection(Of Validate) From {New ValidateFileName() With {.AllowNull = True}}
+        TbExportName.Validate()
+
         TbExportName.HintText = PageVersionLeft.Version.Name
         TbExportDesc.HintText = PageVersionLeft.Version.Info
         PanDisplayItem.Children.Clear()
@@ -229,7 +234,9 @@
 
 #Region "整合包信息 & 预览栏"
     Private Sub TbExportName_TextChanged(sender As MyTextBox, e As TextChangedEventArgs) Handles TbExportName.TextChanged
-        ItemVersion.Title = If(String.IsNullOrWhiteSpace(sender.Text), PageVersionLeft.Version.Name, sender.Text)
+        If String.IsNullOrEmpty(TbExportName.ValidateResult) Then
+            ItemVersion.Title = If(String.IsNullOrWhiteSpace(sender.Text), PageVersionLeft.Version.Name, sender.Text)
+        End If
     End Sub
 
     Private Sub TbExportDesc_TextChanged(sender As MyTextBox, e As TextChangedEventArgs) Handles TbExportDesc.TextChanged