---
title: NoMatchingDataException
summary: API reference for NoMatchingDataException.
status: draft
owner: andmil
last_reviewed: 2026-09-15
library: SAIF.Web.API.Core
reference_type: package
---

# NoMatchingDataException

`NoMatchingDataException` is a concrete `SAIFException` subtype signaling that a requested resource or record could not be found, with a fixed default message of `"Error: No matching data."` when constructed with no arguments ([BR-CORE-003](../../business-rules.md#br-core-003-fixed-default-exception-messages)). It is thrown by [SAIF.Web.API.Clients](../../../saif-web-api-clients/overview.md)'s `ExceptionHandler.ToKnownError` when an HTTP `404` response is received.

## Purpose
- Provide a strongly-typed "not found" signal for consumers, in place of raw `404` status handling ([BR-CORE-003](../../business-rules.md#br-core-003-fixed-default-exception-messages)).
- Guarantee a non-empty, human-readable default message even when no explicit message is supplied ([BR-CORE-003](../../business-rules.md#br-core-003-fixed-default-exception-messages)).

## Context
- Namespace: `SAIF.API.Exceptions`
- Assembly/package: `SAIF.Web.API.Core` (bundled into the `SAIF.Web.API.Clients` NuGet package)

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| `NoMatchingDataException()` | `NoMatchingDataException()` | Constructs the exception with the fixed default message `"Error: No matching data."` ([BR-CORE-003](../../business-rules.md#br-core-003-fixed-default-exception-messages)). |
| `NoMatchingDataException(string message)` | `NoMatchingDataException(string message)` | Constructs the exception with a caller-supplied message. |
| `NoMatchingDataException(string message, Exception innerException)` | `NoMatchingDataException(string message, Exception innerException)` | Constructs the exception with a caller-supplied message and a wrapped inner exception. |
| `NoMatchingDataException(SerializationInfo info, StreamingContext context)` | `NoMatchingDataException(SerializationInfo info, StreamingContext context)` | Standard .NET exception deserialization constructor. |

## Inherited public members

Members in this section are inherited from `SAIFException` in `SAIF.Web.API.Core`. They are available on this type through inheritance.

| Member | Signature | Purpose | Origin |
| --- | --- | --- | --- |
| `HttpStatusCode` | `HttpStatusCode HttpStatusCode { get; set; }` | Associates an HTTP status code with this exception instance; not set by any constructor in this library — assigned by the consumer after construction ([BR-CORE-002](../../business-rules.md#br-core-002-httpstatuscode-carried-by-every-saifexception-subtype)). | `SAIF.Web.API.Core` — `SAIFException` |

## Behavioral notes
- No constructor on this type or on `SAIFException` assigns a default `HttpStatusCode`; a consumer such as `ExceptionHandler.ToKnownError` sets it explicitly after construction.

## Constraints and usage notes
- No `sealed` keyword is present on this type, but it is not subclassed within this library.

This page contains no inferred, unknown, or dependency-sourced statements requiring a note box.

## Sources
- `src/SAIF.Web.API.Core/SAIFException.cs`
- `src/SAIF.Web.API.Clients/ExceptionHandler.cs`