[#82] BaseDataWindow: Fixed error handling after first error to allow saving changes

Elwig/Windows/BaseDataWindow.xaml.Branch.cs

@@ -41,25 +41,26 @@ namespace Elwig.Windows {
             if (!_branchChanged || _branchList == null || _branches == null || _branchIds == null)
                 return;
 
+            // delete
             var deleteZwstIds = _branches.Where(b => b.Value == null).Select(b => b.Key).ToList();
             await ctx.Branches.Where(b => deleteZwstIds.Contains(b.ZwstId)).ExecuteDeleteAsync();
 
-            foreach (var (branch, old) in _branchIds) {
-                branch.ZwstId = old;
-            }
-            foreach (var (old, zwstid) in _branches.Where(b => b.Value != null)) {
-                ctx.Update(ctx.Branches.Find(old)!);
-            }
+            // update
+            ctx.UpdateRange(_branchList
+                .Where(_branchIds.ContainsKey)
+                .Select(b => {
+                    b.ZwstId = _branchIds[b];
+                    ctx.Entry(b).State = EntityState.Added;
+                    return b;
+                }));
             await ctx.SaveChangesAsync();
-
-            foreach (var (old, zwstid) in _branches.Where(b => b.Value != null)) {
+            foreach (var (old, zwstid) in _branches.Where(b => b.Value != null && b.Key != b.Value)) {
                 await ctx.Database.ExecuteSqlAsync($"UPDATE branch SET zwstid = {zwstid} WHERE zwstid = {old}");
             }
 
-            foreach (var branch in _branchList.Where(b => !_branchIds.ContainsKey(b))) {
-                if (branch.ZwstId == null) continue;
-                ctx.Add(branch);
-            }
+            // insert
+            ctx.AddRange(_branchList
+                .Where(b => !_branchIds.ContainsKey(b) && b.ZwstId != null));
             await ctx.SaveChangesAsync();
         }