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Execution seemingly halts for no reason when using Dictionary.add within a foreach loop

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This is really puzzling me as I can't figure out any apparent reason for execution of my method to come to a sudden halt.

The method I have below is relatively simple, all I am doing is iterating through a collection of objects and adding some data to a new Dictionary based on the current data.

public Dictionary<string, string> MapValidationErrorToIdentifiers(List<ErrorField> errors)
 
 var mappings = new Dictionary<string, string>();

 foreach (var error in errors)
 
 string identifier;
 if (error.CollectionIndex == "")
 
 identifier = error.Section + "-" + error.FieldName.Replace(" ", "-");
 
 else
 
 identifier = error.Section + "-" + (error.CollectionIndex + 1) + "-" + error.FieldName.Replace(" ", "-");
 
 identifier = identifier.ToLower();
 mappings.Add(identifier, error.Message);
 

 return mappings;
 

The input object List<ErrorField>, is comprised of ErrorField objects, which are simple DTO objects.

public class ErrorField
 
 public string FieldName get; set; 
 public string Section get; set; 
 public string CollectionIndex get; set; 
 public string Message get; set; 
 

During testing of this method in one instance the errors input object contained 12 ErrorField objects, the foreach completed one iteration successfully, and a key-value pair was added to the dictionary. Then on the second iteration the method worked up until the mappings.Add(identifier, error.Message); call, at which point the debugger stops entirely and no further execution occurs.

The strange thing here is that execution just stops, no exceptions or errors are thrown. This method is part of a larger ASP.NET project, and this method is used within a controller. When the execution halts it causes my end-point to return 404. Not sure if that is relevant or not.

c# asp.net

share|improve this question

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Add() probably throws because the same key is already present, with the exception bring caught by code higher up. Enable first-chance exceptions during debugging to catch it.
  
  – CodeCaster
  Mar 27 at 14:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When you say execution stops, do you mean the program shuts down, or that it is hanging, not getting anywhere?
  
  – Treeline
  Mar 27 at 14:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CodeCaster This is exactly what it was. I enabled all exceptions and the exception appeared. Thanks!
  
  – Jake12342134
  Mar 27 at 16:26
  

  
  
  
  

add a comment | 

0

This is really puzzling me as I can't figure out any apparent reason for execution of my method to come to a sudden halt.

The method I have below is relatively simple, all I am doing is iterating through a collection of objects and adding some data to a new Dictionary based on the current data.

public Dictionary<string, string> MapValidationErrorToIdentifiers(List<ErrorField> errors)
 
 var mappings = new Dictionary<string, string>();

 foreach (var error in errors)
 
 string identifier;
 if (error.CollectionIndex == "")
 
 identifier = error.Section + "-" + error.FieldName.Replace(" ", "-");
 
 else
 
 identifier = error.Section + "-" + (error.CollectionIndex + 1) + "-" + error.FieldName.Replace(" ", "-");
 
 identifier = identifier.ToLower();
 mappings.Add(identifier, error.Message);
 

 return mappings;
 

The input object List<ErrorField>, is comprised of ErrorField objects, which are simple DTO objects.

public class ErrorField
 
 public string FieldName get; set; 
 public string Section get; set; 
 public string CollectionIndex get; set; 
 public string Message get; set; 
 

During testing of this method in one instance the errors input object contained 12 ErrorField objects, the foreach completed one iteration successfully, and a key-value pair was added to the dictionary. Then on the second iteration the method worked up until the mappings.Add(identifier, error.Message); call, at which point the debugger stops entirely and no further execution occurs.

The strange thing here is that execution just stops, no exceptions or errors are thrown. This method is part of a larger ASP.NET project, and this method is used within a controller. When the execution halts it causes my end-point to return 404. Not sure if that is relevant or not.

c# asp.net

share|improve this question

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Add() probably throws because the same key is already present, with the exception bring caught by code higher up. Enable first-chance exceptions during debugging to catch it.
  
  – CodeCaster
  Mar 27 at 14:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When you say execution stops, do you mean the program shuts down, or that it is hanging, not getting anywhere?
  
  – Treeline
  Mar 27 at 14:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @CodeCaster This is exactly what it was. I enabled all exceptions and the exception appeared. Thanks!
  
  – Jake12342134
  Mar 27 at 16:26
  

  
  
  
  

add a comment | 

This is really puzzling me as I can't figure out any apparent reason for execution of my method to come to a sudden halt.

The method I have below is relatively simple, all I am doing is iterating through a collection of objects and adding some data to a new Dictionary based on the current data.

public Dictionary<string, string> MapValidationErrorToIdentifiers(List<ErrorField> errors)
 
 var mappings = new Dictionary<string, string>();

 foreach (var error in errors)
 
 string identifier;
 if (error.CollectionIndex == "")
 
 identifier = error.Section + "-" + error.FieldName.Replace(" ", "-");
 
 else
 
 identifier = error.Section + "-" + (error.CollectionIndex + 1) + "-" + error.FieldName.Replace(" ", "-");
 
 identifier = identifier.ToLower();
 mappings.Add(identifier, error.Message);
 

 return mappings;
 

The input object List<ErrorField>, is comprised of ErrorField objects, which are simple DTO objects.

public class ErrorField
 
 public string FieldName get; set; 
 public string Section get; set; 
 public string CollectionIndex get; set; 
 public string Message get; set; 
 

During testing of this method in one instance the errors input object contained 12 ErrorField objects, the foreach completed one iteration successfully, and a key-value pair was added to the dictionary. Then on the second iteration the method worked up until the mappings.Add(identifier, error.Message); call, at which point the debugger stops entirely and no further execution occurs.

The strange thing here is that execution just stops, no exceptions or errors are thrown. This method is part of a larger ASP.NET project, and this method is used within a controller. When the execution halts it causes my end-point to return 404. Not sure if that is relevant or not.

c# asp.net

share|improve this question

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

public Dictionary<string, string> MapValidationErrorToIdentifiers(List<ErrorField> errors)
 
 var mappings = new Dictionary<string, string>();

 foreach (var error in errors)
 
 string identifier;
 if (error.CollectionIndex == "")
 
 identifier = error.Section + "-" + error.FieldName.Replace(" ", "-");
 
 else
 
 identifier = error.Section + "-" + (error.CollectionIndex + 1) + "-" + error.FieldName.Replace(" ", "-");
 
 identifier = identifier.ToLower();
 mappings.Add(identifier, error.Message);
 

 return mappings;
 

public class ErrorField
 
 public string FieldName get; set; 
 public string Section get; set; 
 public string CollectionIndex get; set; 
 public string Message get; set; 
 

share|improve this question

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

share|improve this question

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges

asked Mar 27 at 14:06

Jake12342134Jake12342134

4281212 bronze badges